Question

if A =70° , B=80° find angle C
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Answer 1

By angle sum property of a triangle,

C = 30°

Answer 2

I'm assuming the angles are of a triangle

70⁰+80⁰+C=180

150⁰+C=180

C=180-150

C= 30

A=70⁰,B=80⁰,C=30⁰