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2014-04-18T19:15:00+07:00
180⁰=2x+3x
180⁰=5x
x=180/5
x=36⁰

sudut=2x=2.36=72⁰

2014-04-18T20:48:39+07:00
180=2x + 3x 180=5x x= 180/5 x=36 sudut =2x = 2×36 =72