# How do you graph #x^2 + y^2 = 81#?

##### 2 Answers

It is an equation of a circle with centre at

#### Explanation:

The equation is of the form of a circle with center at origin, as in the general form of a quadratic equation

and hence it is an equation of a circle with centre at

See below:

#### Explanation:

The equation of a circle is given by

With center

Since we have no

From

graph{x^2+y^2=81 [-20, 20, -10, 10]}

Hope this helps!