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一个圆锥的高为,侧面展开图是半圆,则圆锥的侧面积是( ) A.9π B.18π ...
一个圆锥的高为
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,侧面展开图是半圆,则圆锥的侧面积是( )
A.9π
B.18π
C.27π
D.39π
考点分析:
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