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panjang=7n
2(5n+7n)=96
12n=48
n=4 cm
luas=4×5×4×7
luas=560 cm²
l= 7x
K= 96 m
K= 2(p + l)
96= 2(5x + 7x)
96= 2(12x)
96= 24x
24x= 96
x = 96/24
x = 4
Maka:
p= 5x
= 5(4)
= 20 m
l= 7x
= 7(4)
= 28 m
L. persegi panjang :
p × l
20 × 28
560 m²