**A worksheet to reinforce your students' understanding of the angle sum of a triangle.**

Use this worksheet when learning about the angle sum of triangles.

An answer key is included in the download.

Use in conjunction with

Free teaching resource

**A worksheet to reinforce your students' understanding of the angle sum of a triangle.**

Use this worksheet when learning about the angle sum of triangles.

An answer key is included in the download.

Use in conjunction with

#### Math 6.8(A)

Extend previous knowledge of triangles and their properties to include the sum of angles of a triangle, the relationship between the lengths of sides and measures of angles in a triangle, and determining when three lengths form a triangle;

#### Math 7.11(C)

#### CCSS.MATH.CONTENT.8.G.A.5

Use informal arguments to establish facts about the angle sum and exterior angle of triangles, about the angles created when parallel lines are cut by a transversal, and the angle-angle criterion for similarity of triangles. For example, arrange thre...

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