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# Algebraic Expressions

# Evaluating Formulas by Substitution Examples

### Example 1

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? |