Question

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

Answer 1

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.

Answer 2

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