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How does the equation change when the radius changes? Unlike h and k, why is r always positive?

User Ethilium
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Answer:

When the radius is changed, the constant term (r2) in the equation changes—it becomes bigger as the radius becomes bigger. The term r is always positive because it denotes the length of the radius, which is a distance and not a position or location.

Explanation:

User FlyingAssistant
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