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:
- Draw the right angle AOB
- On side AO, find the point C, such that OC = 2r
- On side BO, find the points D, E, H, such that:
- OE = 2h - 4r
- OH = h
- ED = OC = 2r
- Draw the segment EC
- From the point D, draw the line parallel to EC,
and find point G of intersection with side AO
- The segment CG is the hypotenuse of the triangle in question
- Draw the semicircle on CG as diameter
- From point H draw line parallel to side AO
- Find point L of intersection of line in p. 8 with semicircle in p. 7
The triangle CLG is the triangle in question.
The case when altitude = side of triangle see
here.