McGraw Hill Glencoe Geometry, 2012
MH
McGraw Hill Glencoe Geometry, 2012 View details
1. Classifying Triangles
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Exercise 22 Page 241

Check the angle measures.

Right

Practice makes perfect
Consider the angles on triangle BCD. We can see that △ BCD has two acute angles at B and C, so let's focus on ∠ C.

In the diagram, ∠ C is denoted with a square. This tells us that it is a right angle and its measure is 90^(∘). Since this triangle has a right angle, △ BCD is a right triangle.