Chu vi hình tam giác. Chu vi hình tứ giác
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</div><p></p> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/b50-h2-1664701300.jpg.webp" width="337" height="283" alt="hinh-anh-chu-vi-hinh-tam-giac-chu-vi-hinh-tu-giac-1142-1" title="hinh-anh-chu-vi-hinh-tam-giac-chu-vi-hinh-tu-giac-1142-1" loading="lazy"></p> <p>Tổng độ dài các cạnh của hình tam giác ABC là:</p> <p style="padding-left: 40px;">2 cm + 3 cm + 3 cm = 8 cm&nbsp;</p> <p style="text-align: center;">Ta nói rằng:&nbsp;<strong>Chu vi hình tam giác&nbsp;</strong>ABC là 8 cm.</p> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/b50-h3-1664701391.jpg.webp" width="438" height="261" alt="hinh-anh-chu-vi-hinh-tam-giac-chu-vi-hinh-tu-giac-1142-2" title="hinh-anh-chu-vi-hinh-tam-giac-chu-vi-hinh-tu-giac-1142-2" loading="lazy"></p> <p>Tổng độ dài các cạnh của hình tứ giác MNPQ là:</p> <p style="padding-left: 40px;">3 cm + 4 cm + 2 cm + 5 cm = 14 cm</p> <p style="text-align: center;">Ta nói rằng:&nbsp;<strong>Chu vi hình tứ giác&nbsp;</strong>MNPQ là 14 cm.</p> <p>Tổng độ dài các cạnh của hình tam giác (hình tứ giác) là chu vi của hình đó.</p> <h3 id="1-tiacutenh-chu-vi-cua-caacutec-higravenh-tam-giaacutec-higravenh-tu-giaacutec-sau">1. Tính chu vi của các hình tam giác, hình tứ giác sau:</h3> <p>a)</p> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/b50-h4-1664701576.jpg.webp" width="314" height="252" alt="hinh-anh-chu-vi-hinh-tam-giac-chu-vi-hinh-tu-giac-1142-3" title="hinh-anh-chu-vi-hinh-tam-giac-chu-vi-hinh-tu-giac-1142-3" loading="lazy"></p> <p>b)</p> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/b50-h5-1664701600.jpg.webp" width="360" height="320" alt="hinh-anh-chu-vi-hinh-tam-giac-chu-vi-hinh-tu-giac-1142-4" title="hinh-anh-chu-vi-hinh-tam-giac-chu-vi-hinh-tu-giac-1142-4" loading="lazy"></p> <p>c)</p> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/b50-h6-1664701629.jpg.webp" width="265" height="325" alt="hinh-anh-chu-vi-hinh-tam-giac-chu-vi-hinh-tu-giac-1142-5" title="hinh-anh-chu-vi-hinh-tam-giac-chu-vi-hinh-tu-giac-1142-5" loading="lazy"></p><div> <div class="ads-horizontal-wrapped">
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</div><p></p> <h3 id="2-thuc-hagravenh">2. Thực hành:</h3> <p>Đo độ dài mỗi cạnh rồi tính chu vi của hình tam giác, hình tứ giác dưới đây.</p> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/b50-h7-1664701769.jpg.webp" width="354" height="253" alt="hinh-anh-chu-vi-hinh-tam-giac-chu-vi-hinh-tu-giac-1142-6" title="hinh-anh-chu-vi-hinh-tam-giac-chu-vi-hinh-tu-giac-1142-6" loading="lazy"></p> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/b50-h8-1664701786.jpg.webp" width="345" height="272" alt="hinh-anh-chu-vi-hinh-tam-giac-chu-vi-hinh-tu-giac-1142-7" title="hinh-anh-chu-vi-hinh-tam-giac-chu-vi-hinh-tu-giac-1142-7" loading="lazy"></p> <h3 id="3">3.</h3> <p>Bác Sáu dùng lưới để rào hai mảnh vườn trồng hoa và trồng rau như hình dưới đây. Theo em,bác Sáu cần dùng bao nhiêu mét lưới để rào mảnh vườn trồng hoa, bao nhiêu mét lưới để rào mảnh vườn trồng rau?</p> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/b50-h9-1664701902.jpg.webp" width="643" height="269" alt="hinh-anh-chu-vi-hinh-tam-giac-chu-vi-hinh-tu-giac-1142-8" title="hinh-anh-chu-vi-hinh-tam-giac-chu-vi-hinh-tu-giac-1142-8" loading="lazy"></p>