A circle's radius is increasing. Find the rate of change of the area of the circle with respect to the radius r when 
Definitions:
Non-verbal Signals
Communication cues without the use of words, including gestures, facial expressions, and body language.
Culturally Defined
Aspects or norms that are determined and influenced by the culture in which they are found.
Non-verbal Meanings
Communication conveyed through means other than words, such as gestures, facial expressions, and body language.
Age
The length of time that a person or object has existed, often measured in years.
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