What is the length of the 4th side with a 20 degree angle?

Sorry, I understand I didn't give enough info before. The two side walls are 36" long by 48" in the front. I want the roof to slope back at a 20 degree angle. (I read online that a 20 degree angle on the roof would be good for this.) I just need to know how high the back of the side walls need to be. (Which would also be the height of the board for the back wall.) Hope that is enough info for an answer.  Thanks!!!
in Geometry Answers by Level 1 User (120 points)

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1 Answer

me thank yu yuze plywood 3ft bi 4 ft for side walls & mi ges is yu put it so

4ft part is up.

Then yu hav 3 ft from front tu bak.  & yu want tu kut the top av this sheet av

plywood so reer end is loer than the front.

In that kase, horizontal distans=3ft (or 36 inch).

Vertikal part is horizontal*tangent(20 deg)=36*0.363970234

=13.103 inch or bout 13 & 1/8 inch.  Thats the differ in hite from front tu bak
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