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layang-layang = 1/2 x diagonal 1 x diagonal 2
trapesium = 1/2 x (a + b) x t
a dan b adalah sisi-sisi yang sejajar
Persegi : S x S
Layang" : 1/2 x d1 x d2
Trapesium : 1/2 x a x t (kalau engga salah)