Open Middle®
Directions: The measures of the angles of a convex polygon form an arithmetic sequence. The smallest angle has a measurement of 129 degrees. The largest angle has a measurement of 159 degrees. Find the number of sides in this polygon.
Hint
What are the equations that relate the missing information to the given information?
What formulas do you know that involve arithmetic sequences?
What formulas do you know that involve angles of a polygon?
Answer
10 sides
Source: Ricardo Navarro
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