A circle with a radius of 5 is inscribed in a equilateral triangle. What is the area of the triangle's area minus the circle's area?

First off, the area of the circle would be 78.54

Now, you would do (area of the triangle) - - - AT-78.54=answer

I don't know how to find the area of the triangle with just the circle's radius, so this is all I can do. I'm sorry!