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84=1/3*21*tinggi limas
84=7*tinggi limas
tinggi limas=84/7
=12 cm
Lalas=21 cm2
V=84 cm3
dit :t?
jwb:
V=1/3 x Lalas x t
t=V/La x 1/3
t=84/21 x 1/3=12 cm