geometry - What's a proof that the angles of a triangle add up to 180°? - Mathematics Stack Exchange
If the sum of interior angles goes up by 180 for every point, wouldn't a circle be an astronomical amount? Why does it come back to 360°? : r/askmath
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Types of Angles A right angle has a measure of 90 degrees. An acute angle has a measure of less than 90 degrees. An obtuse angle has a measure greater. - ppt download
