Question 959664
I am building a archway for a gate. The width is 74.4" .  I will use five pieces of material , cut at a 
15  degree angle.   How long should each piece be cut?  The material is 4x4 x8 
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Not clear what you mean.  What is cut at 15 degs?

4x4 x8 what?  inches?  feet?