How to calculate length of roof sides when distance across is known? a2 +b2 = c2?

by TetraDev   Last Updated May 25, 2018 23:21 PM

I am building an A-frame PVC greenhouse. I plan to make the pitch 45 degrees for each side. I have a 10 foot gap across from each side of the wall.

How do I calculator the exact length of each half of the roof? I know there's Pythagoras Theorem (a2 +b2 = c2) but I am unsure how to apply it because I only know "A" and the 45 degree Angle, but not "B" or "C".

Thanks for any help!!

Answers 1

If it's a 45 degree angle, B=A.

Or you can set any value you please for roof height. You don't need to know any trig, nobody cares what the angle is. People who do roofs work in rise/run ratio, not angles.

May 25, 2018 22:52 PM

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