Given only the measure of an angle, use a scientific calculator or a book of mathematical tables (if you can find one!).
There are infinite series but they are not particularly easy to work with.
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196-164/2= 16
72
It is the same length from the centre to any point on the circumference so just measure it
a tangent is a line that touches the circle at only ONE point
Using trigonometry: tangent = opposite/adjacent