Geometry

Question Analysis

The main focus is on determining the radius of the given circle. We need to identify the center of the circle and a point on its circumference, then use the distance formula to calculate the radius.

Key Concept Explanation

The radius of a circle is the distance from the center of the circle to any point on its circumference. The distance formula between two points  and  is .

Step - by - Step Solution

1. Identify the center and a point on the circumference:

Assume the center of the circle is at  (by observing the graph). Since  is on the circle, we'll use it as the point on the circumference.

2. Calculate the radius using the distance formula:

Here,