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= 1/2 x 60(karena segitiga sama sisi)
= 30 derajat
Panjang AD = ((akar) 12^2 + (1/2 12)^2
=(akar) 144 + 36= (akar) 180
=6 (akar) 5
AC = 12
OC = BC : 2 = 12 : 2 = 6
karena segitiga sama sisi , maka ketiga sudut itu sama besar, jadi sudut BAC = ABC = ACB = 60°
sudut DAC = sudut BAC : 2 = 60° : 2 = 30°