A square coaster has a side length of 512 feet on each side.

What is the area of the coaster?

do u mean 5/12

262,144 feet squared

This seems like a big number but area length times width. If the coaster is square then all sides are the same so the length and width are both 512 feet. This means you multiply 512 and 512. With that you get 262,144 feet squared.