# The equation of a circle is #(x + 7)^2 + (y + 2)^2 = 49#. How do you determine the length of the diameter?

##### 1 Answer

Apr 2, 2016

#### Explanation:

For circles in general,

is true.

The equation above is already solved by completing the square, and is in the form above.

Therefore, if

Then,

But this is only the radius. If you want the diameter, multiply the radius by two and get the whole way across the circle.