Berapa lp balok jika panjang 1 m lebar 50 cm tinggi 40cm​

Jawaban:

p = 1 m (100cm)

l= 50 cm

t = 40 cm

lp = 2 x ( pl+ pt+lt)

= 2 x ((100 x 50) + (100 x 40)+ ( 50 x 40))

= 2 x (5000 + 4000 + 2000)

= 2 x 11000

= 22000 cm²