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180 = 6x
x = 30
sudut-sudut :
30,60,90
sudut 2 = 2/6 x 180 derajat = 60 derajat
sudut 3 = 3/6 x 180 derajat = 90 derajat
Jika sudut 1 + sudut 2 + sudut 3 = 180 derajat