Pi Day - The Problems
March 10, 2008

Friday is Pi Day!!

For all of the following calculations use 3.14 for pi.

In honor of Pi Day Wilma’s class is having a pie party. Wilma brought in her favorite kind of pie - apple.  When she cuts her slice of pie it has a central angle of 60 degrees.  If the diameter of the pie was 10 inches, what is the area of Wilma’s slice of pie? Express your answer as a decimal to the nearest tenth.

A buggy has front wheels with a diameter of 12 inches and back wheels with a diameter of 18 inches.  If Molly pushes the buggy for 300 yard how many more revolutions does each of the front wheels make than each of the back wheels? Express your answer as a decimal to the nearest tenth.

Semi circle A’s radius is twice as long as semi circle B’s radius.  The length of semi circle B’s radius is 30 percent of the length of semi circle C’s radius.  None of the semi circles over lap any of the others.  If A’s radius is 10 cm, what is the sum of the areas of semi circles A, B and C?

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