The radius of a circle measures 2 inches. What is the measure of its circumference? a. 14.34 inches c. 8.43 inches b. 10.56 inch
2 answers:
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Answer:
The answer is
Step-by-step explanation:
Assuming the snowball is a perfect sphere, then if A denotes the surface area and D the diameter then:
Differentiating wrt r we have:
We are told that and we want to find
By the chain rule we have:
∴
∴
When D=10 then
The sign (-) shows that the D is decreasing.