Amachinist creates a washer by drilling a hole through the center of a circular piece of metal. if the piece of metal has a radius of x + 7 and the hole has a radius of x + 6, what is the area of the washer?

The area of the washer (which is a circle, but the inner part cut out) is given by:


Now, we need to find the radius of the entire metal circle which the hole was drilled on:


Plug it in to find the area of the metal plate:


Now, you subtract the area of the hole from the area of the plate. The area of the hole will be:



Subtract the area of the hole from the metal plate to get:


That's your answer, although it looks wrong because not much information was provided.