Instructional Video

Khan Academy: Geometry: Example Involving Isosceles Triangle and Parallel Lines

Curated by ACT

Demonstrates how to use the triangle sum theorem, properties of isosceles triangles, and special angle pairs formed when parallel lines are cut by a transversal to set up an equation using given algebraic expressions for angle measures and solve for x. [3:15]

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CCSS: Adaptable
Common Core