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90' = sudut a + sudut a
90' = 2b + b
90' = 3b
90/3 = b
30= b
karena a= 2 x b maka a= 2x 30 = 60'
ditanya: pelurus sudut a =
180'= pelurus sudut a + sudut a
180'=pelurus sudut a + 60
pelurus sudut a = 180 - 60 = 120'
semoga membantu ya^^, jangan lupa jadikan yang terbaik :b