Geometry question about planes and cylinders.
May 2, 2011 2:42 PM Subscribe
Could someone help me with this geometry problem? Cylinder with a plane bisecting it at a 45° angle...
posted by Tchad to science & nature (19 answers total) 2 users marked this as a favorite
I need help with this - I could just play with it in cardboard until I got it right, but if I knew the math it would make it tons easier.
I am making a bolster pillow that is an 8 inch diameter cylinder. This cylinder will have two 90° bends in it.
How do I figure out the shape it would be flat? I know that the shape created when it is sliced through is elliptical and I know how to draw an ellipse, but need to know how to draft it if I am going to then slit the cylinder and open it up. Is the top edge going to be a parabola?
I am looking at this.
I am looking at the second from the top example - I know the dimensions I need for the entire piece at the inside and outside measurements, but need to know what it would look like flat so that I can lay it out and pattern it.
Links to instructions and the formula?