Jawabanmu

2014-04-01T21:15:47+07:00
2014-04-01T22:08:24+07:00
Misal terdiri dari 3 rusuk a,b,c
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