Question

Angle MNO is rotated 90 degrees counterclockwise about the origin to form angle M'N'O'. Which statement shows the measure of angle M'N'O'?

m∠ M'N'O' = 90 degrees
m∠ M'N'O'= 180 degrees
m∠ M'N'O' = 2 ⋅ m∠MNO
m∠ M'N'O' = m∠MNO

Answer 1

The answer is "m∠ M'N'O' = m∠MNO"

Answer 2

The answer is m∠ M'N'O' = m∠MNO

Explanation:

If the Angle MNO is rotated 90 degrees counterclockwise about the origin. The new angle formed by ' will be the same as the rotation doesn't alter neither the shape or size of the figure. Therefore, we can conclude that MNO and M'N'O' are congruent (Same lenght and angle).