Sunspots The area of a circular sunspot is growing at a rate of 1,200 km^2/sec. a. How fast is the radius growing at the instant when it equals 10,000 kilometers?  b. How fast is the radius growing at the instant when the sunspot has an area of 64,000 square kilometers?  (Use the area formula to determine the radius at the instant)

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Sunspots The area of a circular sunspot is growing at a rate of 1,200 km^2/sec.

a. How fast is the radius growing at the instant when it equals 10,000 kilometers? 

b. How fast is the radius growing at the instant when the sunspot has an area of 64,000 square kilometers?  (Use the area formula to determine the radius at the instant)

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