diameter kerucut 10cm tinggi 12cm luas slimut kerucut??

diketahui

d = 10 cm
r = 10/2 = 5 cm
t = 12 cm
s = ?
L. selimut = ?

jawab

mencari S

s² = t² + r²
= 12² + 5²
= 144 + 25
= 169
s = √169
s = 13

L.Selimut = Πrs
= 3,14×5×13
= 3,14×65
= 204,1 cm²

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