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

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

Practice using the converse of the Pythagorean theorem to identify right triangles with this eighth-grade math worksheet!

Support students as they work their way through a proof of the Pythagorean theorem with this eighth-grade geometry worksheet!