Keliling suatu persegi pajang 50 cm, selisih panjang dengan lebarnya 5 cm, luasnya adalah... Cm²

Luas:PXL : 50 × 5 : 250 cm^2

misal
p = x
l = x - 5

K = 2 × ( p + l )
50 = 2 × ( x + x - 5 )
50 ÷ 2 = 2x - 5
25 = 2x - 5
2x = 5 + 25
2x = 30
x = 15

jadi
p = 15 cm
l = 15 - 5 = 10 cm

L = p × l
= 15 × 10
= 150 cm²