Answer:
? = 70°
Explanation:
The exterior angle of a triangle is equal to the sum of the 2 opposite interior angles.
120° is an exterior angle of the triangle, then
? + 50° = 120° ( subtract 50° from both sides )
missing angle = 70 degrees
180 -120 =60, because supplemenatery angles add up to 180 degrees.
sum of all angles of a triangle = 180. so 180-60-50=70 degrees
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