{"id":362,"date":"2025-12-29T14:35:52","date_gmt":"2025-12-29T14:35:52","guid":{"rendered":"https:\/\/huyenkhongnghiemchung.com\/?p=362"},"modified":"2025-12-29T14:35:52","modified_gmt":"2025-12-29T14:35:52","slug":"362","status":"publish","type":"post","link":"https:\/\/huyenkhongnghiemchung.com\/?p=362","title":{"rendered":""},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">2. <a><strong>D\u01af\u01a0NG TR\u1ea0CH L\u1eacP C\u1ef0C \u0110I\u1ec2M<\/strong><\/a><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">L\u1eadp c\u1ef1c l\u00e0 m\u1ed9t thu\u1eadt ng\u1eef chuy\u00ean d\u00f9ng, n\u00f3 l\u00e0 ph\u01b0\u01a1ng ph\u00e1p t\u00ecm ra v\u1ecb tr\u00ed trung t\u00e2m c\u1ee7a c\u0103n nh\u00e0.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Mu\u1ed1n kh\u1ea3o s\u00e1t phong th\u1ee7y c\u1ee7a nh\u00e0 \u1edf, c\u1ea7n ph\u1ea3i t\u00ecm ra trung t\u00e2m \u0111i\u1ec3m, m\u1ed9t khi \u0111\u00e3 t\u00ecm ra trung t\u00e2m \u0111i\u1ec3m th\u00ec c\u00f3 th\u1ec3 \u0111o\u00e1n \u0111\u1ecbnh c\u00e1t hung c\u1ee7a n\u00f3 t\u1eeb t\u00e1m ph\u01b0\u01a1ng v\u1ecb, m\u00e0 mu\u1ed1n t\u00ecm ra v\u1ecb tr\u00ed trung t\u00e2m c\u1ee7a nh\u00e0 c\u1eeda, th\u00ec c\u00f3 m\u1ea5y c\u00e1ch d\u01b0\u1edbi \u0111\u00e2y:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">L\u1ea5y tr\u1ecdng t\u00e2m l\u1ef1c h\u1ecdc trong v\u1eadt l\u00fd l\u00e0m trung t\u00e2m.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B\u1ecf ph\u1ea7n l\u1ed3i \u0111i, r\u1ed3i sau h\u00e3y t\u00ecm trung t\u00e2m \u0111i\u1ec3m.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Th\u00eam ph\u1ea7n l\u00f5m cho \u0111\u1ea7y, r\u1ed3i sau h\u00e3y t\u00ecm trung t\u00e2m \u0111i\u1ec3m.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C\u00e2n b\u1eb1ng nh\u1eefng v\u1ecb tr\u00ed l\u1ed3i l\u00f5m, th\u1eeba thi\u1ebfu, r\u1ed3i sau h\u00e3y t\u00ecm trung t\u00e2m \u0111i\u1ec3m.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ph\u1ee9c t\u1ea1p h\u01a1n l\u00e0 kh\u00f4ng c\u00f3 h\u00ecnh d\u1ea1ng nh\u1ea5t \u0111\u1ecbnh, m\u1ed7i v\u1eadt m\u1ed9t th\u00e1i c\u1ef1c, th\u00ec n\u00ean chia th\u00e0nh v\u00e0i h\u00ecnh kh\u1ed1i nh\u1ecf r\u1ed3i \u0111i t\u00ecm trung t\u00e2m \u0111i\u1ec3m c\u1ee7a m\u1ed7i v\u1ecb tr\u00ed \u0111\u00f3.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Nh\u00e0 c\u1eeda ph\u00f2ng \u1ed1c hi\u1ec7n \u0111\u1ea1i c\u00f3 mu\u00f4n h\u00ecnh v\u1ea1n tr\u1ea1ng, mu\u1ed1n t\u00ecm \u0111\u01b0\u1ee3c \u0111i\u1ec3m l\u1eadp c\u1ef1c (trung t\u00e2m \u0111i\u1ec3m), \u0111\u00f4i khi c\u0169ng g\u1eb7p kh\u00f3 kh\u0103n. D\u01b0\u1edbi \u0111\u00e2y ch\u00fang t\u00f4i v\u00ed d\u1ee5 m\u1ed9t s\u1ed1 m\u1eb7t ph\u1eb3ng h\u00ecnh d\u00e1ng nh\u00e0 c\u1eeda \u0111\u1ec3 qu\u00fd \u0111\u1ed9c gi\u1ea3 tham kh\u1ea3o:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>H\u00ecnh 1:<\/strong> Nh\u00e0 \u1edf h\u00ecnh vu\u00f4ng (k\u1ec3 c\u1ea3 h\u00ecnh ch\u1eef nh\u1eadt), l\u1ea5y giao \u0111i\u1ec3m c\u1ee7a hai \u0111\u01b0\u1eddng ch\u00e9o l\u00e0m \u0111i\u1ec3m l\u1eadp c\u1ef1c (trung t\u00e2m \u0111i\u1ec3m).<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"414\" height=\"413\" src=\"https:\/\/huyenkhongnghiemchung.com\/wp-content\/uploads\/2025\/12\/image-231.png\" alt=\"\" class=\"wp-image-363\" srcset=\"https:\/\/huyenkhongnghiemchung.com\/wp-content\/uploads\/2025\/12\/image-231.png 414w, https:\/\/huyenkhongnghiemchung.com\/wp-content\/uploads\/2025\/12\/image-231-300x300.png 300w, https:\/\/huyenkhongnghiemchung.com\/wp-content\/uploads\/2025\/12\/image-231-150x150.png 150w\" sizes=\"auto, (max-width: 414px) 100vw, 414px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>H\u00ecnh 2:<\/strong> Nh\u00e0 \u1edf h\u00ecnh tam gi\u00e1c l\u1ea5y giao \u0111i\u1ec3m c\u1ee7a hai \u0111\u01b0\u1eddng cao l\u00e0m \u0111i\u1ec3m l\u1eadp c\u1ef1c.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"423\" height=\"406\" src=\"https:\/\/huyenkhongnghiemchung.com\/wp-content\/uploads\/2025\/12\/image-232.png\" alt=\"\" class=\"wp-image-364\" srcset=\"https:\/\/huyenkhongnghiemchung.com\/wp-content\/uploads\/2025\/12\/image-232.png 423w, https:\/\/huyenkhongnghiemchung.com\/wp-content\/uploads\/2025\/12\/image-232-300x288.png 300w\" sizes=\"auto, (max-width: 423px) 100vw, 423px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>H\u00ecnh 3:<\/strong> Nh\u00e0 \u1edf h\u00ecnh thang th\u00ec qu\u00e2n b\u00ecnh l\u1ea1i ch\u1ed7 thi\u1ebfu th\u1eeba, th\u00e0nh h\u00ecnh vu\u00f4ng r\u1ed3i l\u1ea5y giao \u0111i\u1ec3m hai \u0111\u01b0\u1eddng ch\u00e9o h\u00ecnh vu\u00f4ng l\u00e0m \u0111i\u1ec3m l\u1eadp c\u1ef1c.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"522\" height=\"398\" src=\"https:\/\/huyenkhongnghiemchung.com\/wp-content\/uploads\/2025\/12\/image-233.png\" alt=\"\" class=\"wp-image-365\" srcset=\"https:\/\/huyenkhongnghiemchung.com\/wp-content\/uploads\/2025\/12\/image-233.png 522w, https:\/\/huyenkhongnghiemchung.com\/wp-content\/uploads\/2025\/12\/image-233-300x229.png 300w\" sizes=\"auto, (max-width: 522px) 100vw, 522px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>H\u00ecnh 4:<\/strong> Nh\u00e0 \u1edf c\u00f3 m\u1ed9t b\u1ed9 ph\u1eadn th\u1eeba ra, n\u1ebfu ph\u1ea7n th\u1eeba ra n\u00e0y kh\u00f4ng chi\u1ebfm qu\u00e1 m\u1ed9t ph\u1ea7n ba \u0111\u1ed9 d\u00e0i m\u1ed7i c\u1ea1nh th\u00ec c\u1eaft b\u1edbt \u0111i v\u00e0 l\u1ea5y giao \u0111i\u1ec3m hai \u0111\u01b0\u1eddng ch\u00e9o c\u1ee7a h\u00ecnh ch\u1eef nh\u1eadt l\u00e0m \u0111i\u1ec3m l\u1eadp c\u1ef1c.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"645\" height=\"467\" src=\"https:\/\/huyenkhongnghiemchung.com\/wp-content\/uploads\/2025\/12\/image-234.png\" alt=\"\" class=\"wp-image-366\" srcset=\"https:\/\/huyenkhongnghiemchung.com\/wp-content\/uploads\/2025\/12\/image-234.png 645w, https:\/\/huyenkhongnghiemchung.com\/wp-content\/uploads\/2025\/12\/image-234-300x217.png 300w\" sizes=\"auto, (max-width: 645px) 100vw, 645px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>H\u00ecnh 5:<\/strong> Nh\u00e0 \u1edf c\u00f3 m\u1ed9t b\u1ed9 ph\u1eadn l\u00f5m v\u00e0o, n\u1ebfu ph\u1ea7n l\u00f5m kh\u00f4ng chi\u1ebfm qu\u00e1 m\u1ed9t ph\u1ea7n ba, th\u00ec quy t\u1eafc t\u00ecm \u0111i\u1ec3m l\u1eadp c\u1ef1c gi\u1ed1ng h\u00ecnh tr\u00ean nh\u01b0ng kh\u00e1c \u1edf ch\u1ed7 th\u00eam v\u00e0o ph\u1ea7n thi\u1ebfu.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"467\" src=\"https:\/\/huyenkhongnghiemchung.com\/wp-content\/uploads\/2025\/12\/image-242-1024x467.png\" alt=\"\" class=\"wp-image-374\" srcset=\"https:\/\/huyenkhongnghiemchung.com\/wp-content\/uploads\/2025\/12\/image-242-1024x467.png 1024w, https:\/\/huyenkhongnghiemchung.com\/wp-content\/uploads\/2025\/12\/image-242-300x137.png 300w, https:\/\/huyenkhongnghiemchung.com\/wp-content\/uploads\/2025\/12\/image-242-768x350.png 768w, https:\/\/huyenkhongnghiemchung.com\/wp-content\/uploads\/2025\/12\/image-242.png 1143w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>H\u00ecnh 6:<\/strong> Ph\u1ea7n l\u1ed3i v\u00e0 ph\u1ea7n l\u00f5m (d\u01b0 v\u00e0 thi\u1ebfu) b\u1eb1ng nhau th\u00ec ch\u00fang ta chia \u0111\u00f4i di\u1ec7n t\u00edch c\u1ee7a ch\u00fang, r\u1ed3i l\u1ea5y giao \u0111i\u1ec3m c\u1ee7a hai \u0111\u01b0\u1eddng ch\u00e9o l\u00e0m \u0111i\u1ec3m l\u1eadp c\u1ef1c.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"452\" height=\"464\" src=\"https:\/\/huyenkhongnghiemchung.com\/wp-content\/uploads\/2025\/12\/image-235.png\" alt=\"\" class=\"wp-image-367\" srcset=\"https:\/\/huyenkhongnghiemchung.com\/wp-content\/uploads\/2025\/12\/image-235.png 452w, https:\/\/huyenkhongnghiemchung.com\/wp-content\/uploads\/2025\/12\/image-235-292x300.png 292w\" sizes=\"auto, (max-width: 452px) 100vw, 452px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>H\u00ecnh 7:<\/strong> Nh\u00e0 \u1edf c\u00f3 hai v\u1ecb tr\u00ed b\u1ecb thi\u1ebfu khuy\u1ebft th\u00ec ta b\u1ed5 sung th\u00eam v\u00e0o r\u1ed3i l\u1ea5y giao \u0111i\u1ec3m hai \u0111\u01b0\u1eddng ch\u00e9o l\u00e0m \u0111i\u1ec3m l\u1eadp c\u1ef1c.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"680\" height=\"405\" src=\"https:\/\/huyenkhongnghiemchung.com\/wp-content\/uploads\/2025\/12\/image-236.png\" alt=\"\" class=\"wp-image-368\" srcset=\"https:\/\/huyenkhongnghiemchung.com\/wp-content\/uploads\/2025\/12\/image-236.png 680w, https:\/\/huyenkhongnghiemchung.com\/wp-content\/uploads\/2025\/12\/image-236-300x179.png 300w\" sizes=\"auto, (max-width: 680px) 100vw, 680px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>H\u00ecnh 8:<\/strong> Nh\u00e0 \u1edf c\u00f3 m\u1ed9t ph\u1ea7n th\u1eeba ra c\u1ea3 v\u1ec1 hai c\u1ea1nh, ta c\u0169ng x\u00e9t xem m\u1ed7i c\u1ea1nh c\u00f3 \u0111\u1ee7 m\u1ed9t ph\u1ea7n ba hay kh\u00f4ng r\u1ed3i d\u00f9ng quy t\u1eafc b\u1edbt th\u1eeba b\u00f9 thi\u1ebfu \u0111\u1ec3 t\u00ecm \u0111i\u1ec3m l\u1eadp c\u1ef1c.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"647\" height=\"472\" src=\"https:\/\/huyenkhongnghiemchung.com\/wp-content\/uploads\/2025\/12\/image-237.png\" alt=\"\" class=\"wp-image-369\" srcset=\"https:\/\/huyenkhongnghiemchung.com\/wp-content\/uploads\/2025\/12\/image-237.png 647w, https:\/\/huyenkhongnghiemchung.com\/wp-content\/uploads\/2025\/12\/image-237-300x219.png 300w\" sizes=\"auto, (max-width: 647px) 100vw, 647px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>H\u00ecnh 9:<\/strong> Nh\u00e0 \u1edf c\u00f3 hai v\u1ecb tr\u00ed c\u00f9ng th\u1eeba ra, ta c\u0169ng d\u00f9ng quy t\u1eafc \u201cm\u1ed9t ph\u1ea7n ba\u201d \u0111\u1ec3 th\u00eam ho\u1eb7c b\u1edbt, r\u1ed3i l\u1ea5y giao \u0111i\u1ec3m hai \u0111\u01b0\u1eddng ch\u00e9o l\u00e0m \u0111i\u1ec3m l\u1eadp c\u1ef1c.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"655\" height=\"406\" src=\"https:\/\/huyenkhongnghiemchung.com\/wp-content\/uploads\/2025\/12\/image-238.png\" alt=\"\" class=\"wp-image-370\" srcset=\"https:\/\/huyenkhongnghiemchung.com\/wp-content\/uploads\/2025\/12\/image-238.png 655w, https:\/\/huyenkhongnghiemchung.com\/wp-content\/uploads\/2025\/12\/image-238-300x186.png 300w\" sizes=\"auto, (max-width: 655px) 100vw, 655px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>H\u00ecnh 10:<\/strong> Quy t\u1eafc gi\u1ed1ng h\u00ecnh tr\u00ean.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"670\" height=\"383\" src=\"https:\/\/huyenkhongnghiemchung.com\/wp-content\/uploads\/2025\/12\/image-239.png\" alt=\"\" class=\"wp-image-371\" srcset=\"https:\/\/huyenkhongnghiemchung.com\/wp-content\/uploads\/2025\/12\/image-239.png 670w, https:\/\/huyenkhongnghiemchung.com\/wp-content\/uploads\/2025\/12\/image-239-300x171.png 300w\" sizes=\"auto, (max-width: 670px) 100vw, 670px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>H\u00ecnh 11:<\/strong> Nh\u00e0 \u1edf h\u00ecnh ch\u1eef \u201cL\u201d, ta v\u1ea1ch m\u1ed9t \u0111\u01b0\u1eddng th\u1eb3ng gi\u1eefa m\u1ed7i c\u1ea1nh c\u1ee7a ch\u1eef \u201cL\u201d r\u1ed3i l\u1ea5y giao \u0111i\u1ec3m c\u1ee7a hai \u0111\u01b0\u1eddng k\u1ebb n\u00e0y l\u00e0m \u0111i\u1ec3m l\u1eadp c\u1ef1c.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"444\" height=\"373\" src=\"https:\/\/huyenkhongnghiemchung.com\/wp-content\/uploads\/2025\/12\/image-240.png\" alt=\"\" class=\"wp-image-372\" srcset=\"https:\/\/huyenkhongnghiemchung.com\/wp-content\/uploads\/2025\/12\/image-240.png 444w, https:\/\/huyenkhongnghiemchung.com\/wp-content\/uploads\/2025\/12\/image-240-300x252.png 300w\" sizes=\"auto, (max-width: 444px) 100vw, 444px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>H\u00ecnh 12:<\/strong> Trong h\u00ecnh n\u00e0y l\u00e0 s\u01a1 \u0111\u1ed3 m\u1eb7t b\u1eb1ng hai ph\u00f2ng \u0111\u00f4i v\u00e0 m\u1ed9t s\u1ea3nh, c\u0103n c\u1ee9 v\u00e0o nguy\u00ean l\u00fd m\u1ed9t v\u1eadt m\u1ed9t th\u00e1i c\u1ef1c, s\u1ea3nh (ph\u00f2ng kh\u00e1ch) c\u00f3 th\u1ec3 xem l\u00e0 m\u1ed9t \u0111\u01a1n v\u1ecb \u0111\u1ed9c l\u1eadp, do \u0111\u00f3 c\u00f3 th\u1ec3 l\u1eadp c\u1ef1c ri\u00eang ph\u00f2ng kh\u00e1ch.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"814\" height=\"623\" src=\"https:\/\/huyenkhongnghiemchung.com\/wp-content\/uploads\/2025\/12\/image-241.png\" alt=\"\" class=\"wp-image-373\" srcset=\"https:\/\/huyenkhongnghiemchung.com\/wp-content\/uploads\/2025\/12\/image-241.png 814w, https:\/\/huyenkhongnghiemchung.com\/wp-content\/uploads\/2025\/12\/image-241-300x230.png 300w, https:\/\/huyenkhongnghiemchung.com\/wp-content\/uploads\/2025\/12\/image-241-768x588.png 768w\" sizes=\"auto, (max-width: 814px) 100vw, 814px\" \/><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>2. D\u01af\u01a0NG TR\u1ea0CH L\u1eacP C\u1ef0C \u0110I\u1ec2M L\u1eadp c\u1ef1c l\u00e0 m\u1ed9t thu\u1eadt ng\u1eef chuy\u00ean d\u00f9ng, n\u00f3 l\u00e0 ph\u01b0\u01a1ng ph\u00e1p t\u00ecm ra v\u1ecb tr\u00ed trung t\u00e2m c\u1ee7a c\u0103n nh\u00e0. Mu\u1ed1n kh\u1ea3o s\u00e1t phong th\u1ee7y c\u1ee7a nh\u00e0 \u1edf, c\u1ea7n ph\u1ea3i t\u00ecm ra trung t\u00e2m \u0111i\u1ec3m, m\u1ed9t khi \u0111\u00e3 t\u00ecm ra trung t\u00e2m \u0111i\u1ec3m th\u00ec c\u00f3 th\u1ec3 \u0111o\u00e1n \u0111\u1ecbnh &#8230; <span class=\"more\"><a class=\"more-link\" href=\"https:\/\/huyenkhongnghiemchung.com\/?p=362\">[Read more&#8230;]<\/a><\/span><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[12],"tags":[],"class_list":["entry","post","publish","author-admin","post-362","format-standard","category-ly-thuyet-co-ban"],"_links":{"self":[{"href":"https:\/\/huyenkhongnghiemchung.com\/index.php?rest_route=\/wp\/v2\/posts\/362","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/huyenkhongnghiemchung.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/huyenkhongnghiemchung.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/huyenkhongnghiemchung.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/huyenkhongnghiemchung.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=362"}],"version-history":[{"count":1,"href":"https:\/\/huyenkhongnghiemchung.com\/index.php?rest_route=\/wp\/v2\/posts\/362\/revisions"}],"predecessor-version":[{"id":375,"href":"https:\/\/huyenkhongnghiemchung.com\/index.php?rest_route=\/wp\/v2\/posts\/362\/revisions\/375"}],"wp:attachment":[{"href":"https:\/\/huyenkhongnghiemchung.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=362"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/huyenkhongnghiemchung.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=362"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/huyenkhongnghiemchung.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=362"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}