Question

What is the radius of the circle which has the given equation? (x - 2)2 + (y + 1)2 = 16

Answer 1

r = 4units

Explanation:

The standard foem of equation of a line is expressed as;

(x-a)² + (y-b)² = r²

r is the radius

Compare with the given equation (x - 2)^2 + (y + 1)^2 = 16

r² = 16

r = √16

r = 4

Hence the radius of the circle is 4