Perbandingan panjang dan lebar 7:4 jika keliling persegi panjang 66 cm tentukan luas nya

2(p+L) =66
2( 7x + 4x) = 66
11x= 33
x= 3

Luas = 7x (4x) = 21(12)=252cm²

P:l = 7:4
p = 7x
l = 4x

keliling = 2(p+l)
66 = 2(7x+4x)
33 = 11x
x = 3

p = 7x = 21 cm
l = 4x = 12 cm

luas = p . l
luas = 21 . 12 = 252 cm²