Right now we’ll use this problem to obtain another characterization of right triangles, in addition to the ones here.
To start with, here’s an enlarged version of the above image:
In any triangle, the ratio of the length of an internal altitude to the “length” of a right bisector is always sandwiched between and .
In general, the ratio under consideration lies strictly between and .
Together we have: .
When the ratio under consideration equals .
Use similar triangles. Or else use the fact that: from example 1. Take so that . Simplify to get .
- (Silver ratio) Suppose that is a triangle containing an obtuse angle . Let be the foot of the altitude from and let the right bisector of intersect at .
- PROVE that , where is the midpoint of .
- Find a triangle for which , the silver ratio.