Ezy Triangle is a neat tool to solve triangles. It also comes with a helpful list of triangle formulas.
MAIN FEATURES
+ Solve triangles given any 3 out of 6 quanties.
+ Handle ambigous case of multiple solutions.
+ Allows interacting with the triangle.
+ Display side lengths of the triangle.
+ Auto-saving triangle
+ Bundled with a list of triangle-related formulas.
ADDITIONAL FEATURES
+ Full support for iPhone, iPad and Retina display.
+ Portrait & Landscape mode for iPad.
+ Tap & Hold to display inscribed circle and circumscribed circle.