The equation for the circle below is x2 + y2 = 16. What is the length of the circle's radius?

Question

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Answer 1

For a circle centered at (h,k) and radius r

(x-h)² + (y-k)² = r²

 

x² + y² = 16   is the same as

(x-0)² + (y-0)² = 16

 

You have a circle with center at the origin (0, 0)

and radius r = √16

 

Do you know the square root of 16?

 

Answer 2

The radius is √16.