In a
triangle ABC, the median BD is such
that the angles A and DBC are equal. If the measure of the angle ADB is 45 degrees,
prove that the measure of angle A is 30 degrees. Try to use
elementary geometry (Euclid's Elements.)
See
also:
Triangles
Median
Congruence
Circle Geometric Art 01
Kaleidoscope of Geometry Problem 1 based on Poincare Disk Model
Mind Map: George Pólya's 1945 book,
"How to Solve It"
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?
A mind map is a diagram used to visually organize information, knowledge, concepts or ideas.
