Problem 694: Triangle, Angles, 30 Degrees, Auxiliary Construction, Mind Map, Polya
The figure shows a triangle ABC with angle BAD = 18 degrees, angle
DAC = 48 degrees, angle ACD = 30 degrees, and angle BCD = 36
degrees. Find the measure of angle
ABD.
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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