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I am very bad at math and a novice at construction but determined to find the answer to my question. I posted on a mathematics site and the answer I got was very technical and unclear. I thought I would post to a woodworking forum and approach it from another angle. [sorry] :thumbdown:

I want to build a wood mold for a planter based on a design I have drawn in a 3D program however I dont know how to determine the angles of the wood cuts. [figure below]

I think it would be a trapezoid shape. The info I have is

width 18" top

width 10" bottom

height 14"

I believe the top angle is 74º and bottom angle is 106º

Here is a pic of what I want to make. The pic shows a solid object but it isnt. I am designing an empty box/mold for an outdoor container to hold plants/small trees. I will probably make the sides out of 3/4" plywood.

The link to a Cinema4D file is

http://users.adelphia.net/~logiclab/Images/trapezoidPlanter_01.c4d

I need to fine out the cutting angles where the pieces meet. After I do that, I am going to make a second smaller version that fits inside so I can pour concrete inside the two molds. I need 1.5 inches of space between the two molds which would be the thickness of the sides and bottom.

I hope I have explained this correctly and thanks very much for your help. [I wish I could figure this out myself]

Regards,

spindoctor