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

radius = 4

Step-by-step explanation:

Recall that the equation of a circle centered at (0,0) on the plane is given by the formula:

where "r" is the radius of the circle.

S, in our case, since the equation reads:

16 corresponds to the square of the circle's radius. Therefore the radius can be found via:

and since we are talking about the length of a radius, we choose the positive option for the radius = 4