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k.ABCD = S (sisi) x 4 = 4s
k.PQRS = 2(4s) = 8s
k.PQRS = 2(p + l)
k.PQRS = 2(12+9) = 2(21) = 42
k.PQRS = 8s
42 = 8s
s = 42 / 8 = 5.25
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Kel.ABCD = Kel. Persegi = 4s
Kel.PQRS = 2(12+9) = 2(21) = 42
Kel.PQRS = 2.Kel.ABCD
42 = 2.4s
42/2 = 4s
21 =4s
s = 21/4 = 5,25cm
CD = DA = AB = BC = 5,25 cm