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Sara has a clock with a circular face. She wants to glue a ribbon around the outer edge of the face of the clock.
Heaven knows why she thinks this will look good. It would be enough to make Martha Stewart have a conniption fit. Ah, well. To each her own.
If the face of the clock has a radius of 5 inches, how much ribbon will Sara need to complete her aesthetic disaster?
The formula for the circumference of a circle is C = 2πr. Evaluate for r = 5 to find that C = 10π. Sara will need 10π, or approximately 31.4, inches of ribbon. Hey, Sara—guess what time it is? Time to call a professional decorator.