#### Argee

##### Established Member

If the roof structure had been square-based it would have been so much less of a problem, but it isn't square and that's that. So far, the short sides are 350mm and I've cut two equilateral triangles for those. The long sides are 410mm and no matter how I try to calculate the size of the long-side triangles to complete the pyramid, it always comes out wrong.

There are, of course, a number of angles working together here, but I can't seem to visualise it in 3D from a 2D sketch. When the two short-side triangles are set apart by the long side base dimension, the peak is 227mm from the deck, if that's any help.

If I could calculate the base to apex (height) of the long side triangles, or even the base angles required, all would be well, but it's hair-tearing-out time right now! Can anyone shed any light - I don't have a 3D CAD programme (even if I did, I can't afford the time to learn to use one). TIA

Ray.