OrthicTriangle
Fagnano's problem is the inscribed triangle in an acute triangle with the smallest perimeter possible. This is known as the Orthic Triangle and was solved by Giovanni Fagnano in 1775.
To work this project you simply move the points of the outside triangle so that one can see how in an Orthic Triangle not always is the triangle inside always inside. If you would like you could check the box that says Altitudes if you would like to see the altitude to the larger triangle.
Have Fun!