find the unknown angles
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Step-by-step explanation:
a. y=180°-105°. (linear pair)
2x+10+2x+x+y=360°. (angle sum property)
2x+10+2x+x+75°=360°
2x+2x+x+85°=360°
5x= 360-85
5x=275°
x= 275÷5= 55°
2x= 110°
2x+10=110+10=120°
b. x= 20° (Alternate Interior angles)
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