At left we have intersecting parallelograms ABCD and AFCE. Which of the sixteen numbered angles are necessarily the same size as angle #1?

Angles 4, 7, 9, 12, and 15 are all the same size as angle #1.

At left we have intersecting parallelograms ABCD and AFCE. Which of the sixteen numbered angles are necessarily the same size as angle #1?

Angles 4, 7, 9, 12, and 15 are all the same size as angle #1.