Unit 2, Lesson 13, Grade 8 icon
Unit 2, Lesson 13

Angle Sum of a Triangle

EngageNY 45 min(s)

Students know the angle sum theorem for triangles; the sum of the interior angles of a triangle is always 180°. Students present informal arguments to draw conclusions about the angle sum of a triangle. It does not matter what kind of triangle it is (i.e., acute, obtuse, right); when the measure of the three angles are added, the sum is always 180°.

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