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# Triangle Angle Sum Theorem - Classifying Triangles

Worksheet (Geometry)

## Triangle Angle Sum Theorem - Classifying Triangles Worksheet

This free geometry worksheet begins with problems on classifying triangles by the number of congruent sides it has (scalene, isosceles, or equilateral) and by their angles (acute, obtuse, right, or straight). Students must then find missing angles in triangles by applying the properties of these triangles and/or using the Triangle Angle Sum Theorem. Additional problems require an understanding of the defintion and properties of exterior angles in triangles.

## Lesson:

3. To classify triangles and apply the triangle angle sum theorem

13

3

Yes

## Samples:

Angles of Triangles

1-3) Classify each triangle as scalene, isosceles, or equilateral.

4-6) Classify each triangle as acute, right, or obtuse.

7-10) Find the missing value in each triangle.

11-13) Find the values of x and y.