Right-angled triangle with known inradius and altitude

Let r is the radius of incircle and h is the altitude to hypotenuse of the right-angled triangle.
Construct this triangle.

Construction:

  1. Draw the right angle AOB
  2. On side AO, find the point C, such that OC = 2r
  3. On side BO, find the points D, E, H, such that:
  4. Draw the segment EC
  5. From the point D, draw the line parallel to EC, and find point G of intersection with side AO
  6. The segment CG is the hypotenuse of the triangle in question
  7. Draw the semicircle on CG as diameter
  8. From point H draw line parallel to side AO
  9. Find point L of intersection of line in p. 8 with semicircle in p. 7

The triangle CLG is the triangle in question.

[Graphics:ConstrD.jpg]

The case when altitude = side of triangle see here.