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Problem of the day
Write a formula to find the perimeter of a regular octagon. Find the perimeter if one side is 12 cm.
Triangle Sum Rule
•How many degrees in a triangle?
180
•Diagonal – line segment that connects two non-adjacent vertices of a polygon
Example 1
•How many diagonals does a nonagon have?
Example 1
Example 1
Example 2
Example 3
Quick Check
•How many diagonals does a dodecagon have?
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