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2( p + L ) = Keliling
2( 4 + L + L) = 48
4 + 2L = 24
2L = 24-4
2L = 20
L = 10cm
P = 4 +L
= 4 + 10
= 14cm
Luas = P x L
= 14 x 10
= 140cm² ......a
x+4 = panjang
2(x+4) + 2x =48cm
2x +8 + 2x = 48cm
4x = 48-8
4x = 40
x = 10 (lebar)
panjang = 14
Luas = 10 x 14 = 140