Respuesta :

The sum of angle measures inside a triangle equals 180°. Subtract 180-135 to find the measure of angle a. 180-135=45. Then add 45 and 58 to get 103. Then you subtract 103 from 180 to get an answer of 77.

First, find the supplementary angle of angle A. Together, they should add up to 180°, which is a straight line.

123°+y°=180°

y°= 180°-123°

y°=57°

The interior angles of a triangle add up to 180°.

58°+57°+x°=180°

115°+x°=180°

x°=65°

The measure of angle x is 65°.

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