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K.persegipanjang : 2 x (p +lebar)
150cm = 2x (15 + lebar + lebar)
150 cm = 2 x (15 + 2lebar)
150 cm = 30 + 4lebar
150 cm - 30 cm = 4lebar
120 cm = 4 lebar
lebar = 120 : 4
l = 30 cm
maka,
L = p x lebar
= (15 + 30) x 30
= 45 x 30
= 1350 cm
150=2(15+l)
150=30 l
l=150-30
=120/2=6
jdi luas=15x60=900