# How do you write an equation of a circle with Center (-1, 15) Point on Circle (2, 13)?

##### 2 Answers

#### Explanation:

If 'r' is the radius of the circle then its equation would be

Since point (2,13) lies on the circle, it must satisfy the above equation. Thus

Thus the equation of the circle becomes

Please see the explanation.

#### Explanation:

Use the standard equation of a circle:

where

You are not given r, therefore, you must substitute the given point and the center into the standard form, and then compute value of r.

The equation of the circle is: