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Course: High school geometry?>?Unit 3
Lesson 4: Theorems concerning triangle propertiesProve triangle properties
Problem
Liliana tried to prove that in the following diagram.
Step | Statement | Reason |
---|---|---|
1 | Given | |
2 | Construct altitude | |
3 | Definition of altitude | |
4 | Angle-angle-side congruence | |
5 | Corresponding sides of congruent figures have equal lengths. |
What was the first mistake in Liliana's proof?