Chu vi hình chữ nhật. Chu vi hình vuông
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</div><p></p> <p><strong>1. Chu vi hình chữ nhật</strong></p> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/b53-h2-1664716990.jpg.webp" width="362" height="187" alt="hinh-anh-chu-vi-hinh-chu-nhat-chu-vi-hinh-vuong-1170-1" title="hinh-anh-chu-vi-hinh-chu-nhat-chu-vi-hinh-vuong-1170-1" loading="lazy">&nbsp;</p> <p style="text-align: center;">Chu vi hình chữ nhật ABCD là:</p> <p style="text-align: center;">5 + 2 + 5 + 2 = 14 (cm)</p> <p style="text-align: center;">hoặc (5 + 2) x 2 = 14 (cm).</p> <p>Muốn tính chu vi hình chữ nhật ta lấy chiều dài cộng với chiều rộng (cùng đơn vị đo) rồi nhân với 2.</p> <p><strong>2. Chu vi hình vuông</strong></p> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/b53-h3-1664717222.jpg.webp" width="181" height="217" alt="hinh-anh-chu-vi-hinh-chu-nhat-chu-vi-hinh-vuong-1170-2" title="hinh-anh-chu-vi-hinh-chu-nhat-chu-vi-hinh-vuong-1170-2" loading="lazy"></p> <p style="text-align: center;">Chu vi hình vuông MNPQ là:</p> <p style="text-align: center;">3 + 3 + 3 + 3 = 12 (cm)</p> <p style="text-align: center;">hoặc 3 x 4 = 12 (cm).</p> <p>Muốn tính chu vi hình vuông ta lấy độ dài một cạnh nhân với 4.</p> <h3 id="1-tiacutenh-chu-vi-caacutec-higravenh-chu-nhat-higravenh-vuocircng-sau">1. Tính chu vi các hình chữ nhật, hình vuông sau:</h3> <p>a)</p> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/b53-h4-1664717408.jpg.webp" width="324" height="159" alt="hinh-anh-chu-vi-hinh-chu-nhat-chu-vi-hinh-vuong-1170-3" title="hinh-anh-chu-vi-hinh-chu-nhat-chu-vi-hinh-vuong-1170-3" loading="lazy"></p> <p>b)</p> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/b53-h5-1664717427.jpg.webp" width="309" height="303" alt="hinh-anh-chu-vi-hinh-chu-nhat-chu-vi-hinh-vuong-1170-4" title="hinh-anh-chu-vi-hinh-chu-nhat-chu-vi-hinh-vuong-1170-4" loading="lazy"></p> <p>c)</p> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/b53-h6-1664717451.jpg.webp" width="227" height="266" alt="hinh-anh-chu-vi-hinh-chu-nhat-chu-vi-hinh-vuong-1170-5" title="hinh-anh-chu-vi-hinh-chu-nhat-chu-vi-hinh-vuong-1170-5" loading="lazy"></p><div> <div class="ads-horizontal-wrapped">
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</div><p></p> <h3 id="2">2.</h3> <p>a) Tính chu vi hình chữ nhật có chiều dài 12 m, chiều rộng 8 m.</p> <p>b) Tính chu vi hình vuông có cạnh 12 dm.</p> <h3 id="3">3.</h3> <p>a) Tính chu vi tấm lưới thép có dạng hình chữ nhật như hình dưới đây:</p> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/b53-h7-1664717611.jpg.webp" width="637" height="184" alt="hinh-anh-chu-vi-hinh-chu-nhat-chu-vi-hinh-vuong-1170-6" title="hinh-anh-chu-vi-hinh-chu-nhat-chu-vi-hinh-vuong-1170-6" loading="lazy"></p> <p>b) Tính chu vi mảnh vườn có dạng hình vuông như hình dưới đây:</p> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/b53-h8-1664717670.jpg.webp" width="357" height="275" alt="hinh-anh-chu-vi-hinh-chu-nhat-chu-vi-hinh-vuong-1170-7" title="hinh-anh-chu-vi-hinh-chu-nhat-chu-vi-hinh-vuong-1170-7" loading="lazy"></p> <h3 id="4">4.</h3> <p>Một sân bóng rổ có dạng hình chữ nhật với chiều dài 28 m, chiều rộng ngắn hơn chiều dài 13 m. Tính chu vi của sân bóng rổ đó.</p> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/b53-h9-1664717763.jpg.webp" width="631" height="313" alt="hinh-anh-chu-vi-hinh-chu-nhat-chu-vi-hinh-vuong-1170-8" title="hinh-anh-chu-vi-hinh-chu-nhat-chu-vi-hinh-vuong-1170-8" loading="lazy"></p>