Missing parts that complete proof Point q is perpendicular to bisector Mn

The vertices of a rectangle are given in the columns of the matrix . if is found to perform a transformation, what are the coordinates of the transformed rectangle? (0, 0), (0, –3), (–3, –3), (–3, 0) (0, 0), (0, 3), (3, 3), (3, 0) (0, 0), (0, 3), (–3, –3), (–3, 0) (0, 0), (0, 3), (–3, 3), (–3, 0)

One of the same side angles of two parallel lines is 20° smaller than the other one. find the measures of these two angles.

Write the sine and cosine values of a, b, respectively, in the figure for (1) and (2) + explanation.