a. Show that the ratio area:circumference for any circle is r:2, where r is the radius of the circle.
b. Find the ratio volume:surface area for a sphere of radius r, giving your answer as simply as possible.
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Step-by-step explanation:
a.
area : circumference = π r² : 2π r
= r : 2.
b.
volume : surface area = 4/3 π r³ : 4πr²
= r : 3.
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