Home Geometry Problems All problems Visual Index Problems Art Gallery 511520 Double Angle Solution / comment By Antonio Gutierrez
Problem 513: Triangle, Double Angle, Exterior Angle Bisector,
Measure.
Level: High School, College, SAT Prep. The drawing shows a triangle ABC with the exterior angle bisector BD. The angle A is double the angle C. Prove that AD=AB+BC.
Geometry problem solving
Geometry problem solving is one of the most challenging skills for students to learn. When a problem requires auxiliary construction, the difficulty of the problem increases drastically, perhaps because deciding which construction to make is an illstructured problem. By “construction,” we mean adding geometric figures (points, lines, planes) to a problem figure that wasn’t mentioned as "given."

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