SOLUTION: Two- column proof. (click the link to see the problem) https://ibb.co/xqFqMX5

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Question 1177468: Two- column proof.
(click the link to see the problem)
https://ibb.co/xqFqMX5
Answer by mananth(16946) About Me  (Show Source):
You can put this solution on YOUR website!

mangle 1 + m angle2 + m angle 3 = 180 deg. Sum of angles of triangle = 180 deg.

mangle 3 + mangle 4 = 180 deg. angles in a linear pair
Therefore
mangle 1 + m angle2 + m angle 3 = mangle 3 + mangle 4
m angle 3 is common
mangle 1 + m angle2 = mangle 4