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Prove triangle properties


Liliana tried to prove that MN=MP in the following diagram.
2Construct altitude MQ.
3mMQN=mMQP=90°Definition of altitude
4MQNMQPAngle-angle-side congruence
5MN=MPCorresponding sides of congruent figures have equal lengths.
What was the first mistake in Liliana's proof?
Choose 1 answer: