Câu 5 : \( (\mathrm{O} ; \mathrm{R}) \) có ???ng kính \( \mathrm{AB} \). Trên \( (\mathrm{O}) \) l?y \( \mathrm{C} \) sao cho \( B C=R \) và v? ti?p tuy?n \( A x \). Có \( M \) là trung ?i?m \( \mathrm{AC} \) a) Ch?ng minh: \( \mathrm{ABC}=90^{\circ} \) và \( \mathrm{OM} / / \mathrm{BC} \). b) \( \mathrm{OM} \) c?t \( \mathrm{Ax} \) t?i \( \mathrm{D} \). Cminh: \( \mathrm{DC} \) là ti?p tuy?n c?a \( (\mathrm{O}) \) c) Tia DC c?t ti?p tuy?n t?i \( \mathrm{B} \) c?a \( (\mathrm{O}) \) ? \( \mathrm{E} \). \( \mathrm{Cminh} \mathrm{C}, \mathrm{O}, \mathrm{B}, \mathrm{E} \) cùng thu?c m?t ???ng tròn và tính \( \mathrm{S}_{\mathrm{ABED}} \) theo \( \mathrm{R} \). ?E 9
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This means that the angle between BC and the radius OC is 90 degrees. Since M is the midpoint of AC, we can also conclude that angle AMC is 90 degrees. Show more…
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