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∠ADC siku-siku = 90
jumlah sudut dalam segitiga ADC = 180, maka ∠DAC = 180 - 90 - 60 = 30
∠BAC = 90 - 30 = 60
∠ABC = 180 - 60 - 60 = 60
pada segitiga ABC didapatkan besar ∠ A = ∠ B = ∠C = 60.
jadi Segitiga ABC merupakan segitiga sama sisi