Need Help!- Constraining sketches.

[Stampede]

I'm trying to constrain a circle to the origin, but it will not constrain. How I'm doing it is, I choose a circle, click the origin, type in the dimension. But it is still green. What do I need to do?

Thanks.

[klhoard]

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(I'm assuming you're using Inventor)
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Create your circle, then make two dimensions, clicking the **center** of the circle and the origin. Once the dimensions are created, change them to 0 and your circle will be constrained to the origin.
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[legendboy]

you can also draw your circle center point on the orgin, select the center point and click the lock icon in the constraints menu