Question

Fast respond dong bang nomber 12&13 pake cara ya bang.

Answer 1

P = x+3
l = 3x-9

k = 2 (p+l)
60 = 2 (x+3+3x-9)
30 = x+3+3x-9
30 = 4x-6
36 = 4x
x = 9

p = x+3
= 9+3 = 12

l = 3x-9
= 3.9-9 = 18

Luas = 12x18
= 216 cm2