Question

Perbandingan panjang dan lebar persegi panjang 7:5 jika kelilingnyà 72m ,maka luasnya adalah

Answer 1

2 (p+l) = 72
2 (7x + 5x) = 72
2(12x) = 72
24x = 72
x = 3

p = 7x = 7(3) = 21
l = 5x = 5(3) = 15

luas = p.l = 21 . 15 = 315

Answer 2

Panjang = 7/12 x 72 m = 42 m
Lebar = 5/12 x 72 m = 30 m
Luas = 42 m x 30 m
          = 1.260 m²