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Using the charts can be a big help. Before there was the internet, and "Google", and charts, us oldtimers had to figure out what and how to do it with minimal measuring devices.
One of my ways is to set up the base, and take another piece (a straight edged section) and lay it on the base and draw a line across the bottom of the tilted piece. This will get you very close to the angle of tilt (you could call it the spring angle, but I'm more used to using that term in reference to crown moulding).
As for the bevel, set up two pieces from the base at the angle of tilt, Take a strip of wood and lay it across where the two tops meet, and draw a line on both sides on the tops of both pieces. Again, this will get you very close.
To know what you drew, you could use a common drafting protractor to find what angle you have. With the lines drawn, take the piece to the saw of choice, and line up the blade with the line. If you measured the angle, you could just set the saw and try the results for a fit. You may have to make slight adjustments.