Answer:
∠ 2 = 60°
Explanation:
the exterior angle of a triangle is equal to the sum of the 2 remote interior angles.
123° is an exterior angle of the triangle , then
∠ 2 + 63° = 123° ( subtract 63° from both sides )
60
The sum of interior angles in a triangle is equal to 180° so we can write the following equation to find the value of missing angle:
∠2 + 63 + 57 = 180 add like terms
∠2 + 120 = 180 subtract 120 from both sides
∠2 = 60
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