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3+4+5 x = 180
12 x = 180
x = 180/12
= 15
terkecil = 3x = 3 . 15 = 45 derajat.
sudut 1 = 3/3+4+5 x 180
= 3/12 x 180
= 45 derajat
sudut 2 = 4/3 + 4 + 5 x 180
= 4/12 x 180
= 60 derajat
sudut 3 = 5/3 + 4 + 5 x 180
= 5/12 x 180
= 75 derajat
sudut terkecil adalah 45 derajat