you use a protractor.
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use the inverse sine or cosine or tangent
You use the counting numbers: 1, 2, 3, and so on.
3 angles- TRI(three) angles
No not never can a triangle have 3 obtuse angles but it can have 3 acute angles
Use a protractor and you'll find that the 3 interior angles add up to 180 degrees and that the 3 exterior angles add up to 360 degrees