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maka ABCD = 3P dan 3L
Keliling = 2(P + L)
= 2(P + L) : 2(3P + 3L)
= 2P + 2L : 6P + 6L
= 4 : 12
= 1 : 3
Luas = PL
= PL : 3P * 3L
= PL : 9PL
= 1 : 9