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# Center and Radius of Circle [Solved!]

### My question

On your site, the Plane Analytical Geometry Chapter, section 3 - The Circle, at the end of exercise 3 there is the "EXERCISE FOR YOU."

You post that the radius is 1.63. How did you arrive at that number? I come up with 1.58.

3. The Circle

### What I've done so far

I completed the square thereby adding 9/4 and 1/4 to the right side of the equation. So r^2 = 10/4, or 2.5. So r, the square root of 2.5, is 1.58.

X

On  your site, the Plane Analytical Geometry Chapter, section 3 - The Circle, at the end of exercise 3 there is the "EXERCISE FOR  YOU."

You post that the radius is 1.63.  How did you arrive at that number? I come up with 1.58.
Relevant page

<a href="https://www.intmath.com/plane-analytic-geometry/3-circle.php">3. The Circle</a>

What I've done so far

I completed the square thereby adding 9/4 and 1/4 to the right side of the equation.  So r^2 = 10/4, or 2.5. So r, the square root of 2.5, is 1.58.

## Re: Center and Radius of Circle

@phinah: Indeed, you are correct. It was a typo on my part. (The radius of the circle in the image is correct at sqrt(2.5), but my image caption was not.)

I've fixed the issue.

X

@phinah: Indeed, you are correct. It was a typo on my part. (The radius of the circle in the image is correct at sqrt(2.5), but my image caption was not.)

I've fixed the issue.