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panjang = 3x
lebar = 2x
keliling = 2(p+l)
40 = 2(3x+2x)
40 = 2(5x)
40 = 10x
x = 40/10
x = 4
panjang = 3x = 3 x 4 = 12 cm
lebar = 2x = 2 x 4 = 8 cm
luas = p x l
luas = 12 cm x 8 cm
luas = 96 cm²
p+l=40:2
=20
p:l= 3:2
Jawab:
p=3/5 x 20= 12
l= 2/5 x 20 = 8
L=p x l
= 12 x 8 = 96
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