A. 90 degrees b. 45 degrees c. 30 degrees d. 120 degrees

For this case we have by definition, that each of the four internal angles of a square measure 90 degrees.

If we draw the diagonals of the square then the angles are divided by two, that is:

Thus, angle 3 measures 45 degrees.

By definition, the sum of the internal angles of a triangle is 180 degrees.

So:

Thus, angle 2 measures 45 degrees.

45 degrees

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