This eighth-grade geometry worksheet introduces students to the Triangle Angle Sum Theorem and has them practice finding a missing interior angle in a triangle.

Students use the Triangle Angle-Sum Theorem to solve for the variable in triangles where two or more angle measures are linear algebraic expressions.

How much does your child know about triangles? Can they figure out the missing angle in each of these triangles?

Students use the Exterior Angle Theorem to solve for the variable in triangles where two or more angle measures are linear algebraic expressions.

Turn your child into a geometry detective! How many degrees is each missing angle in these quadrilaterals?

Find the measures of missing interior and exterior angles of triangles with this geometry worksheet!

Help students hone their knowledge of different angles with this eighth-grade geometry worksheet about parallel lines cut by a transversal.