<PRE><B>Question 853961</B>
Calculate the size of one of the interior angles of a regular decagon (i.e. a regular 10-sided polygon).
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The hard way:
Sum = 180*(n-2) = 180*8 = 1440 degs
1440/10 = 144 degs
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Easy way:
Ext angle = 360/10 = 36 degs
Int angle = 180 - Ext = 144 degs
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