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110°+a=180°[linear pair]
a=180°+110°=70°
120°+b=180°[linear pair]
b=180°-120°=60°
a+b+c=180°[angle sum property]
70°+60°+c=180°
130°+c=180°
c=180°+130°=50°
c+x=180°[linear pair]
50°+x=180°
x=180°-50°=130°
The value of 'x' is 130°.
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180°- 110° = 70° (Linear pair angle)
180° - 120° = 60° (Linear pair angle)
Two internal angles of the triangle are 60° and 70°,
Sum of two opposite interior angle's sum is equal to one external angle.
60° + 70° = x
If you didn't understood this method then you can find the third internal angle of the triangle by Angle sum property of a triangle, and them apply linear pair angle property then you will be done!!!,
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