Hình tam giác. Hình tứ giác
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</div><p></p> <p style="text-align: center;"><img src="/uploads/tinymce/b12-h1-1666279674.jpg.webp" width="352" height="221" alt="hinh-anh-hinh-tam-giac-hinh-tu-giac-1727-1" title="hinh-anh-hinh-tam-giac-hinh-tu-giac-1727-1" loading="lazy"></p> <p style="text-align: center;">Hình tam giác ABC có:</p> <p style="text-align: center;">3 đỉnh: A, B, C</p> <p style="text-align: center;">3 cạnh: AB, BC, CA</p> <p style="text-align: center;"><img src="/uploads/tinymce/b12-h2-1666279733.jpg.webp" width="424" height="272" alt="hinh-anh-hinh-tam-giac-hinh-tu-giac-1727-2" title="hinh-anh-hinh-tam-giac-hinh-tu-giac-1727-2" loading="lazy"></p> <p style="text-align: center;">Hình tứ giác EKST có:</p> <p style="text-align: center;">4 đỉnh: .?., .?., .?., .?.</p> <p style="text-align: center;">4 cạnh: .?., .?., .?., .?.</p> <h3 id="1-noacutei-theo-mau">1. Nói theo mẫu.</h3> <p><span style="color: #3598db;">Mẫu:</span></p> <p><span style="color: #3598db;"><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/b12-h3-1666279847.jpg.webp" width="273" height="243" alt="hinh-anh-hinh-tam-giac-hinh-tu-giac-1727-3" title="hinh-anh-hinh-tam-giac-hinh-tu-giac-1727-3" loading="lazy"></span></p> <p><span style="color: #3598db;">Hình vuông GHIK có:</span></p> <p style="padding-left: 40px;"><span style="color: #3598db;">4 đỉnh G, H, I, K</span></p> <p style="padding-left: 40px;"><span style="color: #3598db;">4 cạnh GH, HI, IK, KG.</span></p> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/b12-h4-1666279990.jpg.webp" width="550" height="185" alt="hinh-anh-hinh-tam-giac-hinh-tu-giac-1727-4" title="hinh-anh-hinh-tam-giac-hinh-tu-giac-1727-4" loading="lazy"></p> <h3 id="bagravei-tap-1">Bài tập 1:</h3> <p><strong>a) Hình thay vào .?. màu gì?</strong></p> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/b12-h5-1666280045.jpg.webp" width="496" height="138" alt="hinh-anh-hinh-tam-giac-hinh-tu-giac-1727-5" title="hinh-anh-hinh-tam-giac-hinh-tu-giac-1727-5" loading="lazy"></p><div> <div class="ads-horizontal-wrapped">
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</div><p></p> <p><strong>b) Hình thay vào .?. có mấy cạnh?</strong></p> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/b12-h6-1666280079.jpg.webp" width="504" height="146" alt="hinh-anh-hinh-tam-giac-hinh-tu-giac-1727-6" title="hinh-anh-hinh-tam-giac-hinh-tu-giac-1727-6" loading="lazy"></p> <h3 id="bagravei-tap-2nbsp">Bài tập 2:&nbsp;</h3> <p><strong>Hình thay vào .?. có mấy cạnh? Hình đó màu gì?</strong></p> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/b12-h7-1666280131.jpg.webp" width="332" height="220" alt="hinh-anh-hinh-tam-giac-hinh-tu-giac-1727-7" title="hinh-anh-hinh-tam-giac-hinh-tu-giac-1727-7" loading="lazy"></p> <p><strong>Đất nước em</strong></p> <p>Em có biết một loại lương thực mà tên gọi có từ&nbsp;<em>tam giác</em>?</p> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/b12-h8-1666280239.jpg.webp" width="360" height="265" alt="hinh-anh-hinh-tam-giac-hinh-tu-giac-1727-8" title="hinh-anh-hinh-tam-giac-hinh-tu-giac-1727-8" loading="lazy"></p> <p>Nước ta có một vùng đất trồng lúa rộng lớn có hình dạng gần như một tứ giác, thường được gọi là tứ giác Long Xuyên.</p> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/b12-h9-1666280344.jpg.webp" width="341" height="215" alt="hinh-anh-hinh-tam-giac-hinh-tu-giac-1727-9" title="hinh-anh-hinh-tam-giac-hinh-tu-giac-1727-9" loading="lazy"></p> <p>Các thành phố Hà Tiên, Rạch Giá thuộc tỉnh Kiên Giang.</p> <p>Các thành phố Châu Đốc, Long Xuyên thuộc tỉnh An Giang.</p><div class="google-auto-placed ap_container" style="width: 100%; height: auto; clear: both; text-align: center;"><ins data-ad-format="auto" class="adsbygoogle adsbygoogle-noablate" data-ad-client="ca-pub-8123786206223951" data-adsbygoogle-status="done" style="display: block; margin: auto; background-color: transparent; height: 280px;"><div id="aswift_4_host" style="border: none; height: 280px; width: 741px; margin: 0px; padding: 0px; position: relative; visibility: visible; background-color: transparent; display: inline-block;"></div></ins></div> <p>Tìm vị trí các tỉnh Hà Giang, Kiên Giang, An Giang trên bản đồ (trang 96).</p>