# What is the standard form of the equation of a circle with centre (1,7) passing through the point (-4,-5)?

##### 1 Answer

Nov 13, 2015

#### Explanation:

The distance from the point (1,7) to the point (-4,-5) is

Thus the radius of the circle is 13.

But the general form of a circle centred at (a,b) and having radius r is given by

Therefore the equation for this particular circle is