Angle ABC is formed by segments AB and BC on the coordinate grid:

Angle ABC is rotated 90 degrees counterclockwise about the origin to form angle A’B’C’. Which statement shows the measure of angle A’B’C’?

m∠A’B’C’ = 90 degrees
m∠A’B’C’ = 180 degrees
m∠A’B’C’ = m∠ABC
m∠A’B’C’ = 2 × m∠ABC

Question

Angle ABC is formed by segments AB and BC on the coordinate grid: 


Angle ABC is rotated 90 degrees counterclockwise about the origin to form angle A’B’C’. Which statement shows the measure of angle A’B’C’?

 m∠A’B’C’ = 90 degrees
 m∠A’B’C’ = 180 degrees
 m∠A’B’C’ = m∠ABC
 m∠A’B’C’ = 2 × m∠ABC

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