Jawabanmu

2014-03-26T20:04:40+07:00
180 - A = 22/7 (90 - A)
7(180 - A) = 22(90 - A)
1260 - 7A = 1980 - 22A
22A - 7A = 1980 - 1260
15A = 720
A = 720/15 = 48°

Pelurus A = 180 - 48 = 132°
Penyiku A = 90 - 48 = 42°
1 5 1