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McGraw Hill Integrated II, 2012 View details

1. Angles of Triangles

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Exercise 13 Page 339

Use the Triangle Angle-Sum Theorem.

30

Practice makes perfect

We have been given the measures of the two angles of a triangle, 120 and 30. We will find the measure of the third angle using the Triangle Angle-Sum Theorem. This theorem tells us that the measures of the interior angles of a triangle must add to 180^(∘). Let's add some labels to the given diagram.