Question

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

A coordinate grid is shown from positive 6 to negative 6 on the x-axis and from positive 6 to negative 6 on the y-axis. A line segment AB is shown with A as ordered pair 1, negative 1 and B as ordered pair 5, negative 4. Another line segment BC is shown with C as ordered pair 1, negative 4.

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'?
A.m∠ A'B'C' = 90 degrees
B.m∠ A'B'C' = m∠ABC
C.m∠ A'B'C' = 180 degrees
D.m∠ A'B'C' = 2 ⋅ m∠

Answer 1

im thinking either A or C