Pebandingan panjang Dan lebar persegi panjang 4:5.jika kelilingnya 126m maka luasnya adalah

p : l = 4 : 5
p = 4x
l = 5x
K = 2p + 2l
126 = 2(4x) + 2(5x)
126 = 18x
x = 7
p = 4x = 4 x 7 = 28 m
l = 5x = 5 x 7 = 35 m
Luas = p x l = 28 x 35 = 980 m^2