SOLUTION: What is A? STATEMENT 1. M is the midpoint of segment RS; Angle URM is congruent to Angle TSM. REASON 1. Given STATEMENT 2. MR = MS REASON 2. Definition of a midpoint. ST

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Question 252321: What is A?
STATEMENT
1. M is the midpoint of segment RS; Angle URM is congruent to Angle TSM.
REASON
1. Given
STATEMENT
2. MR = MS
REASON
2. Definition of a midpoint.
STATEMENT
3. Angle RMU is congruent to Angle SMT
REASON
3. (A)
STATEMENT
4. Triangle RMU is congruent to Triangle SMT
REASON
4. ASA(Angle-Side-Angle)
Answer by drk(1908)   (Show Source): You can put this solution on YOUR website!
You are asking for the REASON for step 3.
It is definition of vertical angles.
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