Answer:
A
Explanation:
The external angle of a triangle is equal to the sum of the 2 opposite interior angles.
105° is an exterior angle of the triangle , thus
x + 55 = 105° ( subtract 55 from both sides )
x = 50° → A
50 = x
The exterior angle of a triangle is equal to the sum of the opposite interior angles
105 = 55+x
Subtract 55 from each side
105-55 = 55-55+x
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