As in figure 2.In the circular ring of which center is point O.if AO⊥BO,and the area of the shadowy part is 25cm2,then the area of the circuiar ring equals to( ) (π≈3.14)
【考点】面积及等积变换.
【答案】B
【解答】
【点评】
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发布:2024/5/27 14:0:0组卷:69引用:1难度:0.9