Question

When you make the circle smaller which number in the standard equation for a circvle cnetered at the origin decreases?

Answer 1

Hey there,
The radius is the answer.  When you make the circle bigger or smaller, it is the radius of the standard equation for the circle centered at the origin changes.

Hope this helps ^_^

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Answer 2

The radius changes which is the constant when the circle decreases in size and remains at the same center point.