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(2000•嘉兴)圆锥的侧面积是20π,母线长是4,那么这个圆锥的底面半径是( ...
(2000•嘉兴)圆锥的侧面积是20π,母线长是4,那么这个圆锥的底面半径是( )
A.25
B.
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C.5
D.2.5
考点分析:
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