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keliling = 2(P + L)
= 2(4 + L + L)
= 2(4 + 2L)
= 8 + 4L
8 + 4L = 72
4L = 72 - 8
4L = 64
L = 64 / 4
L = 16 cm
P = 4 + L
= 4 + 16
= 20 cm
Luas = PL
= 20 * 16
= 320 cm²
K = 2(p+l)
72 = 2(4+l +l)
72 = 2(4 + 2l)
72 = 8 + 4l
64 = 4l
l = 16
p = 16 + 4 = 20
L = 16 x 20 = 320 cm2