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85问答库 > 根据三视图求几何体的表面积，并画出物体的展开图。

根据三视图求几何体的表面积，并画出物体的展开图。

上面三角形高5，下面长方形长20，圆直径为10

2025-03-17 05:59:25

推荐回答（1个）

回答1：

R1=5√2

L=10π≈31.4

α=10π/10√2π×360°=180√2°≈255°

S1=πR1²/√2=25√2·π≈111

S2=Lh≈31.4×20=628

S3=5²π≈78.5

S=S1+S2+S3=817.5

你如果是做钣金，下面的圆可以不要，另外还得卷边

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