Question

In this diagram, a rectangular sheet of paper ABCD has been creased so that corner A is now placed on edge CD, at A'. Find the size of angle DEA', given that the size of angle ABE is (a) 30 degrees; (b) 27 degrees; (c) n degrees.

Answer 1

Which angles in the picture are equal to each other?

Answer 2

A = A'
ABE = A'BE

Answer 3

?

Answer 4

Your given ABE, your asked to solve DEA'. How then is A'BE related to DEA'?
what angle are the corners?