Find x ...in this triangle ...
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80
the sum of three angle of triangle is 180°. so. 60+40+ x= 180. 100 + x=180. x= 180- 100. x= 80°
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40°+60°+X=180°
100°+X=180°
X=180°-100°
X=80°
100°+X=180°
X=180°-100°
X=80°
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