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panjang = 3x+1
lebar = 2x+2
K = 36 cm
maka :
K = 2 x (p+l)
36 = 2 x (3x+1+2x+2)
36 = 2 x (5x+6)
36 = 10x + 6
10x = 36-6
x = 30/10
x = 3 cm
jadi :
> panjang = 3(3) + 1 = 10 cm
> lebar = 2(3) + 2 = 8 cm
36=2(3x+1+2x+2)
36=2(5x+3)
36=10x+6
36-6=10x
30 =10x
30:10=x
3 =x
P=3x+1=3.3+1=10
L=2x+2=2.3+2=8