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10x = 180⁰
x = 18⁰
sudut A = 54⁰
sudut B = 54⁰
sudut C = 72⁰
10x = 180 derajat
x =18derajat
A = 3 . 18derajat = 54 derajat
B = 3 . 18DERAJAT = 54 derajat
C = 4 . 18derajat = 72 derajat