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panjang : x-5
keliling = 2 (x-5) + 2.x
70 = 2x- 10 + 2x
70 = 4x -10
keliling = 4x -80
4x = 80
x = 20
panjang = 25
lebar = 20
luas = pxl
= 20x25
= 500 m2
70 = 2 ( 5 + l ) + 2l
70 = 10 + 2l + 2l
70 = 10 + 4l
4l = 60
l = 60/4 = 15
Luas = p x l = ( 5 + 15 ) x 15 = 20 x 15 = 300 m^2