Góc vuông, góc không vuông
<p>Hai kim ở mỗi đồng hồ tạo thành hình ảnh<em> góc</em>.</p> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/b13-h1-1667063206.jpg.webp" width="347" height="83" alt="hinh-anh-goc-vuong-goc-khong-vuong-1991-0" title="hinh-anh-goc-vuong-goc-khong-vuong-1991-0" loading="lazy"></p><div> <div class="ads-horizontal-wrapped" style="height: auto !important; min-height: 0px !important;">
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</div><p></p> <p>•&nbsp;<strong>Góc vuông</strong></p> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/b13-h2-1667063256.jpg.webp" width="150" height="104" alt="hinh-anh-goc-vuong-goc-khong-vuong-1991-1" title="hinh-anh-goc-vuong-goc-khong-vuong-1991-1" loading="lazy"></p> <p style="text-align: center;">Góc đỉnh O;<br>cạnh OA, OB.</p> <p style="text-align: center;"><img src="/uploads/tinymce/b13-h3-1667063331.jpg.webp" width="149" height="113" alt="hinh-anh-goc-vuong-goc-khong-vuong-1991-2" title="hinh-anh-goc-vuong-goc-khong-vuong-1991-2" loading="lazy"></p> <p style="text-align: center;">Góc đỉnh M;<br>cạnh MP, MQ.</p> <p>•&nbsp;<strong>Góc không vuông</strong></p> <p style="text-align: center;"><img src="/uploads/tinymce/b13-h4-1667063430.jpg.webp" width="174" height="103" alt="hinh-anh-goc-vuong-goc-khong-vuong-1991-3" title="hinh-anh-goc-vuong-goc-khong-vuong-1991-3" loading="lazy"></p> <p style="text-align: center;">Góc đỉnh .?.;<br>cạnh .?., .?.</p> <p style="text-align: center;"><img src="/uploads/tinymce/b13-h5-1667063463.jpg.webp" width="173" height="101" alt="hinh-anh-goc-vuong-goc-khong-vuong-1991-4" title="hinh-anh-goc-vuong-goc-khong-vuong-1991-4" loading="lazy"></p> <p style="text-align: center;">Góc đỉnh .?.;<br>cạnh .?., .?.</p> <p>•&nbsp;<strong>Dụng cụ kiểm tra góc vuông, vẽ góc vuông</strong></p> <p style="text-align: center;"><img src="/uploads/tinymce/b13-h6-1667063549.jpg.webp" width="141" height="112" alt="hinh-anh-goc-vuong-goc-khong-vuong-1991-5" title="hinh-anh-goc-vuong-goc-khong-vuong-1991-5" loading="lazy"></p><div> <div class="ads-horizontal-wrapped">
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</div><p></p> <p style="text-align: center;"><em>Kiểm tra góc vuông</em></p> <p style="text-align: center;"><img src="/uploads/tinymce/b13-h7-1667063572.jpg.webp" width="340" height="125" alt="hinh-anh-goc-vuong-goc-khong-vuong-1991-6" title="hinh-anh-goc-vuong-goc-khong-vuong-1991-6" loading="lazy"></p> <p style="text-align: center;">Các góc đỉnh O và đỉnh M là các góc vuông.</p> <p style="text-align: center;"><img src="/uploads/tinymce/b13-h8-1667063617.jpg.webp" width="342" height="126" alt="hinh-anh-goc-vuong-goc-khong-vuong-1991-7" title="hinh-anh-goc-vuong-goc-khong-vuong-1991-7" loading="lazy"></p> <p style="text-align: center;">Các góc đỉnh D và đỉnh K là các góc không vuông.</p> <p style="text-align: center;"><img src="/uploads/tinymce/b13-1667063689.jpg.webp" width="495" height="118" alt="hinh-anh-goc-vuong-goc-khong-vuong-1991-8" title="hinh-anh-goc-vuong-goc-khong-vuong-1991-8" loading="lazy"></p> <p style="text-align: center;"><em>Vẽ góc vuông</em></p> <h3 id="1-tao-higravenh-goacutec-vuocircng-goacutec-khocircng-vuocircng">1. Tạo hình góc vuông, góc không vuông.</h3> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/b13-h12-1667063785.jpg.webp" width="436" height="145" alt="hinh-anh-goc-vuong-goc-khong-vuong-1991-9" title="hinh-anh-goc-vuong-goc-khong-vuong-1991-9" loading="lazy"></p> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/b13-h13-1667063801.jpg.webp" width="188" height="145" alt="hinh-anh-goc-vuong-goc-khong-vuong-1991-10" title="hinh-anh-goc-vuong-goc-khong-vuong-1991-10" loading="lazy"></p><div> <div class="ads-horizontal-wrapped">
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</div><p></p> <h3 id="2">2.</h3> <p><strong>Gấp tờ giấy theo hình sau để được góc vuông.</strong></p> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/b13-h14-1667063951.jpg.webp" width="406" height="104" alt="hinh-anh-goc-vuong-goc-khong-vuong-1991-11" title="hinh-anh-goc-vuong-goc-khong-vuong-1991-11" loading="lazy"></p> <h3 id="3nbsp">3.&nbsp;</h3> <p><strong>Dùng ê-ke để kiểm tra xem góc nào dưới đây là góc vuông.</strong></p> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/b13-h15-1667064008.jpg.webp" width="441" height="136" alt="hinh-anh-goc-vuong-goc-khong-vuong-1991-12" title="hinh-anh-goc-vuong-goc-khong-vuong-1991-12" loading="lazy"></p> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/b13-h16-1667064024.jpg.webp" width="332" height="135" alt="hinh-anh-goc-vuong-goc-khong-vuong-1991-13" title="hinh-anh-goc-vuong-goc-khong-vuong-1991-13" loading="lazy"></p> <h3 id="4">4.</h3> <p><strong>Dùng ê-ke kiểm tra để biết mỗi hình sau có mấy góc vuông rồi nói theo mẫu.</strong></p> <p><span style="color: #3598db;">Mẫu:</span></p> <p style="text-align: center;"><span style="color: #3598db;"><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/b13-h17-1667064214.jpg.webp" width="163" height="131" alt="hinh-anh-goc-vuong-goc-khong-vuong-1991-14" title="hinh-anh-goc-vuong-goc-khong-vuong-1991-14" loading="lazy"></span>Tứ giác ABCD có 4 góc, trong đó có 2 góc vuông là: góc đỉnh A và góc đỉnh D.</p> <p style="text-align: center;"><img src="/uploads/tinymce/b13-h18-1667064282.jpg.webp" width="183" height="128" alt="hinh-anh-goc-vuong-goc-khong-vuong-1991-15" title="hinh-anh-goc-vuong-goc-khong-vuong-1991-15" loading="lazy"></p><div> <div class="ads-horizontal-wrapped">
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</div><p></p> <p style="text-align: center;"><img src="/uploads/tinymce/b13-h19-1667064297.jpg.webp" width="162" height="175" alt="hinh-anh-goc-vuong-goc-khong-vuong-1991-16" title="hinh-anh-goc-vuong-goc-khong-vuong-1991-16" loading="lazy"></p> <p style="text-align: center;"><img src="/uploads/tinymce/b13-h20-1667064317.jpg.webp" width="185" height="132" alt="hinh-anh-goc-vuong-goc-khong-vuong-1991-17" title="hinh-anh-goc-vuong-goc-khong-vuong-1991-17" loading="lazy"></p> <h3 id="5-dugraveng-ecirc-ke-ve-mot-goacutec-vuocircng">5. Dùng ê-ke vẽ một góc vuông.</h3> <h3 id="bagravei-tap-1-chon-yacute-tra-loi-duacuteng">Bài tập 1: Chọn ý trả lời đúng.</h3> <p>Số góc vuông trong hình bên là:</p> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/b13-h21-1667064453.jpg.webp" width="169" height="116" alt="hinh-anh-goc-vuong-goc-khong-vuong-1991-18" title="hinh-anh-goc-vuong-goc-khong-vuong-1991-18" loading="lazy"></p> <p style="text-align: center;">A. 1&nbsp; &nbsp;B. 2&nbsp; &nbsp;C. 3&nbsp; &nbsp;D. 4</p>