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d = 14 cm, r = 1/2 d = 7 cm
v = 1/3 phi r²x t
1.232 = 1/3 x 22/7 x 7² x t
1.232 = 1/3 x 22 x 7 x t
1.232/22 x 7 = 1/3 t
8 = 1/3 t
8 ÷ 1/3 = t
8 x 3 = t
24 = t
s ( sisi miring) dicari pakai phytagoras
s = √ 24² + 7²
= √ 576 + 49
= √ 625
s = 25
luas selimut = phi x r x s
= 22/7 x 7 x 25
= 550 cm²