In a pyramid I have the side plans $25^{\circ}$ from vertical line. I will make a L-shaped support in the corners. In the CAD I can see it will be $100.29^{\circ}$ between the planes. How can calculate this with formulas? Could not attach picture in the system but I can seen separate.
Pyramid and angle between planes
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geometry
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3I'm having a hard time parsing your question. Could you please upload your diagram to [imgur](http://imgur.com/)? Someone will later embed the image into your question for you. – 2011-09-15