Each entry in a multiplication table, as shown in the 2 -by-2 table at the right, is the product of the factor shown at the left and the factor shown at the top.
ROT = r_90⁰, r_180⁰, r_270⁰, r_360⁰ REF = R_x , R_y , R_y=x, R_y=-x

be the sets of rotations and reflections, respectively, as described in Lesson 12-5. Build each 4-by-4 multiplication table.
a.
b.
c.
d.