Question

find third angle of triangle 80 degree 70 degree
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Answer 1

80+30+x=180 degrees. Because we know that sum of all angles in a triangle is 180. =>x=180-110. =>x=70 degrees.
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Answer 2

30°

given, first angle=80°

second angle=70°

therefore third angle=180°-(80+70)°=180°-150°=30°[since sum of angles of triangle is=180°]

hence, the third angle of triangle is 30 degree