Upgraded to work with iOS 7. CalcTriangle is and easy to use and understand right triangle calculator. All you need to do is type in any two sides or any angle and one side and then press the Calc button. Tap on the side or angle field you want to enter a dimension in and type in the number you want to enter. You can then select either the inch or foot symbol and the picker wheel for that field pops up, in foot mode you select inches and fractions of an inch. The angle fields are decimal. Once you have entered a value, select tap the Calc button and it will calculate the rest of the sides and angles along with the area and perimeter.