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Diket : p= 15 cm
Tanya : L= ?
Jawab : 15/3 = 5
p= 3x5 = 15
l= 2x5= 10
t= 4x5= 20
L= p.l.t = 15x10x20 =3000
Jadi, luas balok = 3000cm2
=2(15.10) + 2(10.20) + 2 (15.20)
=2x150 + 2x200 + 2x300
=300 + 400 + 600
=1300 cm2
klo tdk slh..