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Sudut bersesuaian
Sisi sisi bersesuaian sebanding
Sudut sudah pasti bersesuaian.
Namun , sisi sisinya
P1 , L1 = 10 , 8
P2 ,L2 = 21 , 13
P1/P2 = L1 / L2
10/21 = 8/13
21 x 8 = 130
161 tidak sama dgn 130
Artinya tak sebangun