In the diagram, $MQ$MQ is perpendicular to $PR$PR, and $\Delta MPR$ΔMPR is isosceles.
What is the measure of $\angle MQR$∠MQR?
From the information given, we know $\triangle MPQ$△MPQ and $\triangle MRQ$△MRQ are congruent because:
Which congruence test matches our argument from the previous part?
Write, analyze, complete, or identify formal proofs (e.g., direct and/or indirect proofs/proofs by contradiction).