對不起圖上不來呀
in the figure shown,what is the area of the circular region with centerO and diameter BC?
(1) BC/AB=3/4
(2) BD=25
ANS C
我選B
因為 BCD為直角三角形,1:1:根號2
即可求BC and the area of the circular region
請問我錯在哪?
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