Big Ideas Math Integrated I, 2016
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Big Ideas Math Integrated I, 2016 View details
3. Proving Triangle Congruence by SAS
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Exercise 4 Page 605

An included angle is the angle formed by two sides.

∠ LKP

Practice makes perfect
The included angle is the angle formed by the two given sides, PK and LK. From the diagram, we can see that this angle is ∠ LKP.