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= 5 x 20
= 100
L = 100 : 2
= 50
keliling = 240cm
p : l = 7 : 5
Misal :
p = 7x
l = 5x
2.(p+l) = 240
2.(7x+5x) = 240
2.12x = 240
24x = 240
24x= 240
24 = 24
x = 10
Panjang : 7 . 10 = 70cm
Lebar = 5 . 10 = 50cm