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# What is the radius of the circle whose equation is x^{2} + y^{2} = 9?

**Solution:**

The general equation of the circle is given by

(x - h)^{2} + (y - k)^{2 }= r^{2}

Where, (h, k) is the center

r is the radius

Given,

The equation of the circle is x^{2} + y^{2} = 9

So, r^{2} = 9

Taking square root,

r = 3

Therefore, the radius of the circle is 3 units.

## What is the radius of the circle whose equation is x^{2} + y^{2} = 9?

**Summary:**

The radius of the circle whose equation is x^{2} + y^{2} = 9 is 3 units.

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