SOLUTION: if the sum of nine angles of a decagon is 1350 degrees, how large is theh tenth angle?
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Question 256207: if the sum of nine angles of a decagon is 1350 degrees, how large is theh tenth angle?
Answer by solver91311(24713) (Show Source): You can put this solution on YOUR website!
The sum of the interior angles of any n-gon is given by:
)
degrees.
Substitute 10 for n, do the arithmetic, then subtract 1350, the sum of 9 of the angles, from the sum of all ten to get the measure of the last one.
John
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