Question

Panjang dan lebar persegi panjaang = 5 : 7
jika keliling = 96m. maka luasnya adalah...

Answer 1

P :l
5 : 7
5y : 7y

keliling = 2(p+l)
96 = 2(5y+7y)
96 = 2(12y)
96 = 24y
96 : 24 = y
4 = y

panjang = 5y = 5 x 4 = 20 cm
lebar = 7y = 7 x 4 = 28 cm

luas = p x l
luas = 20 cm x 28 cm
luas = 560 cm²