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A : B = 3 : 1
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A. Sudut A = (pake perbandingan tadi) 3 per 2 ( 2 dari selisih perbandingan A-B = 3-1 = 2) X 70
= 105° (INI SUDUT A...!!!)
Sudut B = 1/2 x 70 = 35° (INI SUDUT B..!!!)
Sudut A + Sudut B = 105° + 35° = 140°
b.pelurus sudut A = 180°- 105° = 75°
SELESAI....