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Problem 511: Triangle, Double Angle, Angle Bisector, Measure.
Level: High School, College, SAT Prep.

The drawing shows a triangle ABC with the angle bisector BD. The angle A is double the angle C. Prove that AD=BC-AB.


Triangle, Double Angle, Angle Bisector
 
 

Mind Map: "How to Solve It, A new aspect of Mathematical Method"


George Pólya's 1945 book "How to Solve It, A new aspect of Mathematical Method", is a book describing methods of problem solving. It suggests the following steps when solving a mathematical problem: (1) First, you have to understand the problem. (2) After understanding, then make a plan. (3) Carry out the plan. (4) Look back on your work. How could it be better? 

 

Mind Map Help. To see a note: Hover over a yellow note button. To Fold/Unfold: click a branch. To Pan: click and drag the map canvas.

Problem Solving. Activate Flash plugin or Javascript and reload to view the Mind Map of How to Solve It, Interactive Mind Map, Elearning.

 

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