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如图,已知圆锥的高为4,底面圆的直径为6,则此圆锥的侧面积是( ) A.12π ...
如图,已知圆锥的高为4,底面圆的直径为6,则此圆锥的侧面积是( )
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A.12π
B.15π
C.24π
D.30π
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