Angle proof

Problem:



Solution;

#	Statement	Reason
1	<1 = <3	Given
2	<1 = <2	Opposite Angle
3	<2 = <3	#1 and #2 simplify

So far so good with the proof - in order for us to proof <2 = <4, however, we will need <3 = < 4.

If that is given, that would be great, otherwise, there is no way we can prove that out of the given information.