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The base of a lampshade is in the shape of a circle and has a diameter of 13 inches. What is the circumference, to the nearest tenth of an inch, of the base of the lampshade? (Use 3.14 for π.)

Sagot :

The formula for the circumference of a circle is 
C=2πr, or πd
where r is the radius.
Substitute the values!
C=πd
C=(3.14)(13 in)
C=40.82 in
Since the given is round it off to the nearest tenth, then the answer is:
C=40.8 in

Hope this helps =)