Hình tròn
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</div><p></p> <p style="text-align: center;"><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/b52-h1-1666542729.jpg.webp" width="207" height="169" alt="hinh-anh-hinh-tron-1879-1" title="hinh-anh-hinh-tron-1879-1" loading="lazy">Hình tròn <em>tâm </em>O,&nbsp;<br><em>bán kính</em> OM,<br><em>đường kính </em>AB.</p> <p>Dùng thước đo rồi so sánh độ dài các đoạn thẳng OM, OA, OB.</p> <p style="padding-left: 80px;">Trong một hình tròn:</p> <ul> <li>Các bán kính dài bằng nhau.</li> <li>Tâm là trung điểm của đường kính.</li> <li>Đường kính dài gấp hai lần bán kính.</li> </ul> <h3 id="1">1.</h3> <p><strong>Nêu tên tâm, các bán kính, đường kính có trong mỗi hình tròn sau.</strong></p> <p>a)</p> <p>&nbsp;<img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/b52-h3-1666543123.jpg.webp" width="220" height="223" alt="hinh-anh-hinh-tron-1879-2" title="hinh-anh-hinh-tron-1879-2" loading="lazy"></p> <p>b)</p> <p style="text-align: center;"><img src="/uploads/tinymce/b52-h4-1666543149.jpg.webp" width="278" height="249" alt="hinh-anh-hinh-tron-1879-3" title="hinh-anh-hinh-tron-1879-3" loading="lazy"></p> <h3 id="2-thuc-hagravenh-ve-higravenh-trograven-bang-com-pa">2. Thực hành vẽ hình tròn bằng com-pa.</h3> <p>a) Sử dụng com-pa để vẽ hình tròn.</p> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/b52-h-1666543301.jpg.webp" width="375" height="174" alt="hinh-anh-hinh-tron-1879-4" title="hinh-anh-hinh-tron-1879-4" loading="lazy"></p> <p>b) Vẽ em bé và ông mặt trời.</p> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/b52-h5-1666543324.jpg.webp" width="209" height="194" alt="hinh-anh-hinh-tron-1879-5" title="hinh-anh-hinh-tron-1879-5" loading="lazy"></p><div> <div class="ads-horizontal-wrapped">
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</div><p></p> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/b52-h6-1666543336.jpg.webp" width="207" height="203" alt="hinh-anh-hinh-tron-1879-6" title="hinh-anh-hinh-tron-1879-6" loading="lazy"></p> <h3 id="bagravei-tap-1-cacircu-nagraveo-duacuteng-cacircu-nagraveo-sai">Bài tập 1: Câu nào đúng, câu nào sai?</h3> <p style="padding-left: 40px;">Trong một hình tròn:</p> <p>a) Chỉ có một bán kính và một đường kính.</p> <p>b) Có nhiều bán kính và nhiều đường kính.</p> <p>c) Các đường kính dài bằng nhau.</p> <p>d) Đường kính dài gấp 2 lần bán kính.</p> <p><strong>Khám phá</strong></p> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/b52-h7-1666543457.jpg.webp" width="255" height="129" alt="hinh-anh-hinh-tron-1879-7" title="hinh-anh-hinh-tron-1879-7" loading="lazy"></p> <p style="text-align: center;">Hình ảnh trên lá cờ Olympic<br>(Thế vận hội)</p>