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Mathematics
Junior High
yin
yin

求解

博上練如右圖,BD為圓O的直徑,直線ED為圓O的切線,A、 C兩點在圓上,AC平分∠BAD且交BD於F點。若AD= 38°,則∠AFB的度數為何? B OF 38÷2=199 CD=142÷2=910 180°-381-112° ·E38 CAFB:180° 71°=109 6 1160 Ans: 109° D
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