Brian Monetti, I took way too many science classes in college!
The area of a rectangle will always be equal to the Base (sometimes called Width) x Height, or in an equation, A=bh. You will always need to know two of the variables in order to find the third, so to find the Area, you will need to know both the Base and the Height. One exception is if the rectangle is also a square, in which case the Base is equal to the Height. In that case, the Area will just be the Base x Base. Hope this helps!