Ew Ugly Diagram

Geometry Level 5

Let A B C ABC be a right triangle with right angle at C C such that A C = 3 AC = 3 and B C = 4 BC = 4 . The circumcircle of A B C ABC has center D D and the incircle of A B C ABC touches the sides at points E , F , E, F, and G G , with E E on A B AB , F F on A C AC , and G G on B C BC . Triangles E D F EDF and F G D FGD have incenters H H and I I , respectively. If H I = k HI = k , then find 100 k \lfloor 100 k \rfloor .

Details and assumptions:

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The answer is 106.

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1 solution

Himanshu Arora
Jun 9, 2014

Coordinate Geometry

Take C C as origin. All points can be easily marked and labeled by their co ordinates. Find the in-center of the two triangles using the formula in this link . Find the distance. The approach is hectic and tedious, I couldn't think of a better. Post your solutions as well.

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