# How do you graph x^2+y^2=9 and what are its lines of symmetry?

Apr 27, 2017

#### Answer:

This is the standard form for the graph of a circle! ${\left(x - h\right)}^{2} + {\left(y - k\right)}^{2} = {r}^{2}$
Doesn't a circle have infinitely many lines of symmetry?

#### Explanation:

Let's look at the graph... its center will be at (0,0), and the radius = 3.

Imagine any line drawn through the center will "split" the circle in half, and can be called a line of symmetry.