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2. 2. 36= 72°
3. 11x -5+ 7x= 85
11x+7x= 85+5
18x= 90
x= 90/18= 5°
6. 3a+2a= 180
5a= 180
a= 36, 2a= 2. 36= 72
9. e= 360-90-45-162= 63°
10. c adalah sudut lancip dan c = 60°
mohon maaf apabila salah