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p = 2x + 3
K = 2 (p + l)
36 = 2 (2x + 3 + x)
36/2 = 3x + 3
18 = 3x + 3
18-3 = 3x
15 = 3x
x = 15/3
x = 5 cm
maka :
p = 2x + 3
p = 2.5 + 3
p = 10 + 3
p = 13 cm
l = x
l = 5 cm
L = p x l
L = 13 x 5
L = 65 cm²