The area of a circle is found with the formula a= where 3.14 represents 3.14. if a tile artist is laying down tiles in a circular mosaic pattern and the area of the circle is 706.5 square feet, what is the radius of the circle in feet?
a. 11
b. 13
c. 15
d. 17

I think you meant to write that the Area is equal to πr^2 (A = πr^2). and that π = 3.14.

You just have to plug in the amounts given in the equation then and solve:

A = πr^2 

706.5 ft^2 = 3.14(r)^2 

Divide both sides by 3.14:

225 ft^2 = r^2 

Now take the square root of both sides:

15 ft = r

The radius is 15 feet.