试题与答案

小亮测得一圆锥模型的底面半径为5cm,母线长为7cm,那么它的侧面展开图的面积是

题型:填空题

题目:

小亮测得一圆锥模型的底面半径为5cm,母线长为7cm,那么它的侧面展开图的面积是______cm2(结果保留三个有效数字).

答案:

底面半径为5cm,则底面周长=10π,侧面展开图的面积=

1
2
×10π×7=35π≈110cm2

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