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rusuk kubus = 5cm
panjang balok= 18cm
lebar balok=5cm
tinggi balok= 9cm
Dit: Luas keseluruhan bangun tsb?
Jawab:
Luas kubus= 6×s pangkat 2 = 6× 5 pangkat = 6×25=150cm2
Luas Balok=2( p×l+pxt+l×t )= 2{(18×5)+(18×9)+(5×9)} =2(90+162+45)=2(297) =594cm2
Jadi luas keseluruhan= 150cm2+594cm2=744cm2