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V = pi x r2 x t
1540 = 3,14 x r2 x 10
1540 = 31,4
r2 = 1540 ÷ 31,4
r = akar 49
r = 7
Lalas = 2 x pi x r
= 2 × 22/7 × 7
= 44 cm kuadrat
Lselimut = 2 x pi x r x t
= 2 x 22/7 × 7 × 10
= 440 cm kuadrat
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