Keliling persegi panjang 34cm panjangnya 10 cm betapa luas persegipanjang?

2(p+l) = 34
2(10+x) = 34
20 + 2x = 34
2x = 34-20
2x = 14, x = 14/2 = 7
Luas = p • l = 10 • 7 = 70cm^2

Keliling = 2 ( l + p )
34 = 2 ( l + 10 )
34 = 2L + 20
2L = 34 – 20
2L = 14
L = 14/2 = 7

l yang di atas dimaksud lebar ya.

luas = lebar x panjang
luas = 7 x 10
luas = 70 cm2