The radius of the circle whose equation is (x - 3)² + (y + 1)² = 16 is
a). 4
b). 8
c). 16

The equation of a circle is written as (x-h)^2 + (y-k)^2 = r^2

Where the center point of the circle is (h,k) and r is the radius.

In the given equation 16 = r^2

To find r take the square root of both sides:

r = √16

r = 4

The answer is A.

OPTION A.

Step-by-step explanation:

The equation of a circle in center-radius form  is:

Where the center is at the point (h,k) and "r" is the radius.

Then, given the equation of the circle:

You can idenfity that:

Therefore, in order to find the radius, you need to solve for "r".

Then, this is:

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