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a= rusuk paling panjang
b= rusuk sedang
c=rusuk pendek
c x b= 15 cm²
c x a=20 cm²
a x b =27 cm²
a² =( a x b ) x (c x a) / c x b
= 27 x 20 /15
=36
a = 6
volume = a x b x c = a x (b x c)
=6 (15)
=90