求圆柱的表面积。 (1)直径=4cm,高=3cm,S侧=?S底=?S表=? (2)半径=1dm,高

2025-05-11 16:32:07
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回答1:

(1)S侧=3.14×4×3=37.68cm²
S底=3.14×(4/2)²=12.56cm²
S表=37.68+12.56=50.24cm²
(2)S侧=3.14×1×2×5=31.4dm²
S底=3.14×1²=3.14dm²
S表=31.4+3.14=34.54dm²
(3)S侧=31.4×5=157cm²
S底=3.14×(31.4÷3.14÷2)²=78.5cm²
S表=157+78.5=235.5cm²
(4)S侧=3.14×3×2×4=75.36dm²
S底=3.14×3²=28.26dm²
S表=75.36+28.26=103.62dm²
(4)S侧=3.14×8×3.5=87.92cm²
S底=3.14×(8/2)²=50.24cm²
S表=87.92+50.24=138.16cm²
(5)S侧=25.12×4=100.48dm²
S底=3.14×(25.12÷3.14÷2)²=50.24dm²
S表=100.48+50.24=150.72dm²