Triangle Solver and realistic drawing of a solved triangle

[mcjtom]

Built in Triangle Solver App is great: this is so universally useful and yet relatively difficult to solve that I think all calculators should have it as a built-in function/solver - without having to programme it.

Two ideas for improvement are:

- reporting area and perimeter
- updating the triangle image so that it approximately reflects the solution

I would find the latter improvement invaluable in explaining to students why sometimes there are two solutions to a triangle, sometimes none... Also, the provided triangle image is useful for entering known elements, but it's quite confusing when the solved triangle is not even close to the shape of the static triangle image shown - I have to cover the triangle drawing when displaying it in class not to confuse the students...