Răspuns:
Explicație pas cu pas:
1)
∡A=∡B=143°
-
2)
2x+35= 4x-85
4x-2x= 120
2x= 120
x= 120:2
x= 60 °
∡A= 2x+35
∡A=2*60+35
∡A= 155°
∡B=4x-85
∡B= 4*60-95
∡B=55°
3)
2x+25+4x+65=180°
2x+4x=180-25-65
6x= 90
x= 90:6
x= 15°
-∡A= 2*15+25
∡A= 55
∡B= 4*15+65
∡B=125°
