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luas selimut = 96 phi
luas selimut = 2 x phi x r x t
t : r = 3 : 1
2 x phi x r x 3r = 96 phi
6 r^2 = 96
r^2 = 16
r = 4
t = 12
volum = phi x r^2 x t
= phi x 4^2 x 12
= 192 phi
jawaban A
no 74)
= 30800 / (22/7 x 7 x 7 x 10)
= 30800 / 1540
= 20
jawaban D