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12a² = 300
a² = 300/12
a² = √25
a = 5
sisi -sisinya
4a = 4 x 5 = 20
3a = 3 x 5 = 15
2a = 2 x 5 = 10
volum = p xl xt
= 20 x 15 x 10
=3000 cm³