Observe the graph:
\Vertices of square are
and
.
Find rotation at about the origin.
Write the ordered pair as a vertex matrix.
\Write the vertex matrix for square is
.
To rotate about the origin, multiply the vertex matrix by
.
.
Write the vertices of the image.
\ The first row represents the -coordinates and the second row represents the
-coordinates.
The vertices are and
.
The image vertices are and
.