# How do you write the equation of the circle with diameter that has endpoints at (–1, –6) and (–3, –2).?

##### 1 Answer

Jun 30, 2016

#### Explanation:

The center of the circle is the middle point of the diameter.

Then its coordinates are obtained by using

in this case:

The radius is the half of the diameter, that is obtained by calculating the distance

in this case:

To obtain teh equation of the circle you can substitute in the general equation

(the general equation is