问题
选择题
圆锥底面圆的半径为1cm,母线长为6cm,则圆锥侧面展开图的圆心角是( )
A.30°
B.60°
C.90°
D.120°
答案
设圆锥侧面展开图的圆心角为n.
根据题意得2π×1=nπ×6 180
解得n=60°.
故选B.
圆锥底面圆的半径为1cm,母线长为6cm,则圆锥侧面展开图的圆心角是( )
A.30°
B.60°
C.90°
D.120°
设圆锥侧面展开图的圆心角为n.
根据题意得2π×1=nπ×6 180
解得n=60°.
故选B.