Geometry

Question Analysis

The main focus is to determine the radius of the circle by applying the standard form of the circle equation to the given algebraic equation.

 

Key Concept Explanation

The standard form of a circle's equation is , where  is the center of the circle and  is the radius. The number on the right - hand side of the equation is the square of the radius, and  must be non - negative.

 

Step - by - Step Solution

1. Compare with the standard form:

Given the equation , compare it with . We see that