Pythagorean Theorem - finding the hypotenuse
Move the sliders to change the values of the two sides - between 1 and 12. Try to calculate the length before you check the answer. When doing these questions you should write your work in the same way.
There is more information on the Pythagorean theorem here http://greenmaths.blogspot.ie/2014/09/pythagorean-theorem.html.