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They work out as two equal opposite angles of 120 degrees and two equal opposite angles of 60 degrees.
50 internal angles though it will take some time to work out what they are.
use the inverse sine or cosine or tangent
The 3 interior angles of any triangle add up to 180 degrees
Supplementary angles total 180 degrees. If you have one angle, subtract it from 180 to find its supplement.