Area of a rectangle with a base of 8cm and a diagonal of 8.5cm

To get the area multiply NinjaDevo's value of a by 8.

That's great...but what's the question? :)

I'm thinking your probably want to find the height of the rectangle.

Here, we need to break this apart into a right triangle and solve and using the Pythagorean Theorem. Here we want to find the height (or a)