Hi everybody! I need help, and this question is worth TEN points!
A statement and portions of the flowchart proof of the statement are shown.
Which reason should appear in the box labeled 1?
A: Angle Addition Postulate
B: Linear Pair Postulate
C: Ruler Postulate
D: Angle Congruence Postulate
Please don't give me a direct answer - help me work out the problem so I can finish the rest on my own and learn something too.
