Also with rotations, we may need to identify the rotation, i.e. find its centre of rotation, magnitude or angle of rotation, and direction of rotation. Or we may need to execute the rotation.
Note that we will only have to rotate objects by 90°, 180°, 270° or 360°. We need to be able to rotate around any centre of rotation though, including points outside of the object or on vertices or edges of the object.
Rotate the shape above by 90° clockwise around:
(a) the origin; and
(b) point A.