Big Ideas Math Geometry, 2014
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Big Ideas Math Geometry, 2014 View details
5. Indirect Proof and Inequalities in One Triangle
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Exercise 53 Page 342

An included angle is the angle created by the intersection of two lines or line segments.

∠ CEB

Practice makes perfect
To name the included angle between CE and BE we need to find the angle created by their intersection.

We can see that the sides intersect at E and the angle between them is ∠ CEB.