Is there a formula for these kind of questions?

m = 55°

Step-by-step explanation:

The 2 top interior angles of the triangle are adjacent angles on a line, then

180° - 115° = 65°

180° - 120° = 60°

The sum of the 3 angles in a triangle = 180°

Subtract the sum of the 2 angles fro 180° for third angle

third angle = 180° - (65 + 60)° = 180° - 125° = 55°

m is vertically opposite the third angle and congruent to it

m = 55°

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