Home Geometry Problems All problems Visual Index Problems Art Gallery 511520 Double Angle Post a solution By Antonio Gutierrez
Problem 515: Triangle, Double Angle, Altitude,
Measure.
Level: High School, College, SAT Prep. The drawing shows a triangle ABC with the altitude BD. If the angle A is double the angle C,
prove that CD=AB+AD.
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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