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π x r x s =204,1
3,14 x 5 x s = 204,1
15,7 x s = 204,1
s =204,1 /15,7
s = 13 cm
luas permukaan krucut
Lp = La + Ls
= 3,14 x 5 x 5 + 204,1
= 78,5 + 204,1
= 282,6 cm²
204,1 = 3,14.5.s
204,1 = 15,7.s
15,7.s = 204,1
s = 204,1 / 15,7
s = 13 cm