In reply to zimpara:
I'm maybe misunderstanding what has been suggested, but if you have a 100x100mm block and cut from the top edge on one side to 70mm down from the top edge on the opposite side, you do indeed get a 35£ sloper.
But if you have a block the same 100mm heigh t but twice the width at 200mm (so it's in "landscape" format when viewed in section) and cut 70mm down from the top edge, you only have a 19£-ish sloper.
Edit: for that example template linked to above, the base dimension has to be 114mm for it to be 35°. Any other base length and the slope is not 35°.
Or am I missing something?
Post edited at 13:28