Problem 688: Triangle, Angles, 10, 20, 30, 40, 60 Degrees, Measure,
The drawing shows a triangle ABC with points E and D on AB and
AC, respectively. If the measure of the angles BAC, ACE, BCE,
and ABD are 20, 30, 10, and 60 degrees, respectively, find the measure of
angle BDE.
How to Solve It, Interactive Mind Map
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.

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