jika luas selimut tabung 314 cm2 dan jari jari nya10 cm. tentukan ( π = 3,14). volume nya
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Jawab:
L selimut = 314 cm²
r = 10 cm
(cari T dahulu dengan rumus luas selimut)
L selimut = 2 πrt
314 = 2 x 3,14 x 10 x t
314 = 62,8 x t
t = 314 / 62,8
t = 5 cm
kemudian cari volume
V = πr²t
= 3,14 x 10 x 10 x 5
= 1.570 cm³