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20 = 1/2 x 5 x t
8 cm = t
tinggi segitiga ABC = alas segitiga ABT
sehingga :
Labt = 1/2 x a x t
40 = 1/2 x 8 x t
10 cm = t
tinggi segitiga ABT = tinggi limas T.ABC
sehingga volume limas :
V = 1/3 x La x t
V = 1/3 x 20 x 10
V = 200/3
V = 66 2/3 cm3.