Question

two angles of a triangle measure 45° and 80° therefore the measure third angle is​

Answer 1

Sum of triangle = 180

Third angle + 80+45=180

Third angle =180-125

Third angle = 55

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Answer 2

Sum of the all angles of triangle = 180°

Let the third angle be x

x + 45 + 80 = 180

x = 180 - 125

x = 55°

Third angle = 55°

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