perbandingan panjang dan lebar persegi panjang 7 : 4 jika keliling persegi panjang tersebut 66 cm, maka luasnya adalah. tolong bantu ya kaka :)

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

Maka:
p = 7x = 7 . 3 = 21
l = 4x = 4 . 3 = 12

Jadi, luasnya = p . l = 21 . 12 = 252 cm²

panjang : lebar = 7 : 4 = 7x : 4x

Keliling = 66 cm
2(p + l) = 66 cm
2(7x + 4x) = 66 cm
2(11x) = 66 cm
22x = 66 cm
x = 3 cm

panjang = 7x = 7(3) = 21 cm
lebar = 4x = 4(3) = 12 cm

luas = p × l = 21 × 12 = 252 cm² (D)



semoga membantu