The number of degrees that ABC has been rotated counterclockwise about the origin is: A. 90°
Meaning of degree, clockwise and counterclockwise movement
We can define a degree (°) as a way of angle measurement according to application in mathematics geometry.
When something moves clockwise, it is said to move in the direction of a clock hand, which is to move to the right while counterclockwise is going against the normal direction of a clock thereby moving to the left.
Hence we can conclude by saying since the diagram was only rotated backward once, it is calculated to have done a 90° counclockwise movement
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