Question

The point C (4, 4) has been rotated by 180⁰ counter clock wise about the point (1, 3). Determine the coordinates for the point C’.

Answer 1

C'(-3, -1)

Explanation:

A transformation is the movement of a point from its initial position to a new position. Types of transformation are reflection, rotation, dilation and translation.

If a point A(x, y) is rotated 180 degrees counterclockwise about the origin the new coordinates is A'(-x, -y)

Since C(4, 4) is rotated about point (1, 3), we have to make point (1, 3) the origin. This means the new origin O' is at (1, 3). The horizontal and vertical distance between the new origin and point C gives the new coordinate of point C. Point C x coordinate is 3 units from the new origin and y coordinate is 1 unit from the new origin, hence the new coordinate of point C is (3, 1).

A 180⁰ counter clock wise rotation of point C would give a new point at C'(-3, -1)