Question

Diketauhi perbandingan panjang dan lebar persegi panjang 5:3 jika keliling 160 cm2 maka panjang dikurangi lebar adalah.... cm

Answer 1

K = 2(p+l)
160 = 2(5a+3a)
160 = 2(8a)
160 = 16a
a = 10

p = 5a = 5(10) = 50 cm
l = 3a = 3(10) = 30 cm

Maka;
p - l = 50 - 30 = 20 cm