The figure below shows a
triangle ABC where A1, B1, and C1 are on BC, AC, and AB,
respectively, so that the
of triangles AB1C1, BA1C1, and
CA1B1 are equal to d. If r is the inradius
of triangle ABC and r1 is
of triangle A1B1C1, prove that
r1 = r - d.
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
A mind map is a diagram used to visually organize information, knowledge, concepts or ideas.
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by Antonio Gutierrez
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Last updated: Sep 19, 2014