Debuah balok memiliki ukuran panjang 25 cm, lebar 20 cm, dan tinggi 15 cm. Luas permukaan balok adalah...
a. 1.850 cm²
b. 2.050 cm²
c. 2.175 cm²
d. 2.350 cm²
a. 1.850 cm²
b. 2.050 cm²
c. 2.175 cm²
d. 2.350 cm²
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25×20=500cm2
25×15=375cm2
20×15=300cm2
1175×2=2350cm2
luas permukaan balok
lp= 2 x [(p x l)+(p x t)+(l x t)]
lp= 2 x [(25x20)+(25x15)+(20x15)]
lp= 2 x [500+375+300]
lp= 2 x 1.175
lp=2.350