Bài 5: Góc có đỉnh ở bên trong đường tròn. Góc có đỉnh ở bên ngoài đường tròn
Hướng dẫn giải Bài 37 (Trang 82 SGK Toán 9 Hình học, Tập 2)
<p>Cho đường tr&ograve;n (O) v&agrave; hai d&acirc;y AB,AC bằng nhau. Tr&ecirc;n cung nhỏ AC lấy một điểm M.Gọi S l&agrave; giao điểm của AM v&agrave; BC. Chứng minh&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><mover><mrow><mi>A</mi><mi>S</mi><mi>C</mi></mrow><mo>^</mo></mover><mo>=</mo><mover><mrow><mi>M</mi><mi>C</mi><mi>A</mi></mrow><mo>^</mo></mover></math>.&nbsp;</p> <p>Giải</p> <p><img class="wscnph" src="https://static.colearn.vn:8413/v1.0/upload/library/28022022/z3219107722656_483c2636f6c70ea03a217015bf5b6253-ILvIVY.jpg" /></p> <p><math xmlns="http://www.w3.org/1998/Math/MathML"><mi>T</mi><mi>a</mi><mo>&#160;</mo><mi>c</mi><mi>&#243;</mi><mspace linebreak="newline"/><mover><mrow><mi>A</mi><mi>S</mi><mi>C</mi></mrow><mo>^</mo></mover><mo>=</mo><mfrac><mrow><mi>s</mi><mi>&#273;</mi><mfenced><mrow><mover><mrow><mi>A</mi><mi>B</mi></mrow><mo>&#9180;</mo></mover><mo>-</mo><mover><mrow><mi>M</mi><mi>C</mi></mrow><mo>&#9180;</mo></mover></mrow></mfenced></mrow><mn>2</mn></mfrac><mo>&#160;</mo><mfenced><mn>1</mn></mfenced><mspace linebreak="newline"/><mo>(</mo><mover><mrow><mi>A</mi><mi>S</mi><mi>C</mi></mrow><mo>^</mo></mover><mo>&#160;</mo><mi>l</mi><mi>&#224;</mi><mo>&#160;</mo><mi>g</mi><mi>&#243;</mi><mi>c</mi><mo>&#160;</mo><mi>c</mi><mi>&#243;</mi><mo>&#160;</mo><mi>&#273;</mi><mi>&#7881;</mi><mi>n</mi><mi>h</mi><mo>&#160;</mo><mi>n</mi><mi>&#7857;</mi><mi>m</mi><mo>&#160;</mo><mi>b</mi><mi>&#234;</mi><mi>n</mi><mo>&#160;</mo><mi>n</mi><mi>g</mi><mi>o</mi><mi>&#224;</mi><mi>i</mi><mo>&#160;</mo><mi>&#273;</mi><mi>&#432;</mi><mi>&#7901;</mi><mi>n</mi><mi>g</mi><mo>&#160;</mo><mi>t</mi><mi>r</mi><mi>&#242;</mi><mi>n</mi><mo>&#160;</mo><mo>(</mo><mi>O</mi><mo>)</mo><mo>)</mo><mspace linebreak="newline"/><mi>v</mi><mi>&#224;</mi><mo>&#160;</mo><mover><mrow><mi>M</mi><mi>C</mi><mi>A</mi></mrow><mo>^</mo></mover><mo>=</mo><mfrac><mrow><mi>s</mi><mi>&#273;</mi><mfenced><mover><mrow><mi>A</mi><mi>M</mi></mrow><mo>&#9180;</mo></mover></mfenced></mrow><mn>2</mn></mfrac><mo>&#160;</mo><mfenced><mn>2</mn></mfenced><mspace linebreak="newline"/><mo>(</mo><mi>g</mi><mi>&#243;</mi><mi>c</mi><mo>&#160;</mo><mi>n</mi><mi>&#7897;</mi><mi>i</mi><mo>&#160;</mo><mi>t</mi><mi>i</mi><mi>&#7871;</mi><mi>p</mi><mo>&#160;</mo><mi>c</mi><mi>h</mi><mi>&#7855;</mi><mi>n</mi><mo>&#160;</mo><mi>c</mi><mi>u</mi><mi>n</mi><mi>g</mi><mo>&#160;</mo><mover><mrow><mi>A</mi><mi>M</mi></mrow><mo>&#9180;</mo></mover><mo>&#160;</mo><mo>)</mo><mspace linebreak="newline"/><mi>T</mi><mi>h</mi><mi>e</mi><mi>o</mi><mo>&#160;</mo><mi>g</mi><mi>i</mi><mi>&#7843;</mi><mo>&#160;</mo><mi>t</mi><mi>h</mi><mi>i</mi><mi>&#7871;</mi><mi>t</mi><mo>&#160;</mo><mo>:</mo><mspace linebreak="newline"/><mi>A</mi><mi>B</mi><mo>=</mo><mi>A</mi><mi>C</mi><mo>&#8658;</mo><mover><mrow><mi>A</mi><mi>B</mi></mrow><mo>&#9180;</mo></mover><mo>&#160;</mo><mo>=</mo><mover><mrow><mi>A</mi><mi>C</mi></mrow><mo>&#9180;</mo></mover><mo>&#160;</mo><mfenced><mn>3</mn></mfenced><mspace linebreak="newline"/><mi>T</mi><mi>&#7915;</mi><mo>&#160;</mo><mfenced><mn>1</mn></mfenced><mo>&#160;</mo><mi>v</mi><mi>&#224;</mi><mo>&#160;</mo><mfenced><mn>2</mn></mfenced><mo>,</mo><mo>&#160;</mo><mfenced><mn>3</mn></mfenced><mo>&#160;</mo><mi>s</mi><mi>u</mi><mi>y</mi><mo>&#160;</mo><mi>r</mi><mi>a</mi><mo>&#160;</mo><mo>:</mo><mspace linebreak="newline"/><mover><mrow><mi>A</mi><mi>B</mi><mo>&#160;</mo></mrow><mo>&#9180;</mo></mover><mo>-</mo><mover><mrow><mi>M</mi><mi>C</mi></mrow><mo>&#9180;</mo></mover><mo>=</mo><mover><mrow><mi>A</mi><mi>C</mi></mrow><mo>&#9180;</mo></mover><mo>-</mo><mover><mrow><mi>M</mi><mi>C</mi></mrow><mo>&#9180;</mo></mover><mo>&#160;</mo><mo>=</mo><mover><mrow><mi>A</mi><mi>M</mi></mrow><mo>&#9180;</mo></mover><mo>&#160;</mo><mspace linebreak="newline"/><mi>T</mi><mi>&#7915;</mi><mo>&#160;</mo><mi>&#273;</mi><mi>&#243;</mi><mo>&#160;</mo><mover><mrow><mi>A</mi><mi>S</mi><mi>C</mi></mrow><mo>^</mo></mover><mo>=</mo><mover><mrow><mi>M</mi><mi>C</mi><mi>A</mi><mo>&#160;</mo></mrow><mo>^</mo></mover></math></p>
Hướng dẫn Giải Bài 37 (Trang 82, SGK Toán Hình học 9, Tập 2)
GV: GV colearn
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Hướng dẫn Giải Bài 37 (Trang 82, SGK Toán Hình học 9, Tập 2)
GV: GV colearn