Angles only go up to 360 degrees unless it's 1 and 1/36 of a revolution
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An acute triangle.
If you have one angle, you can draw two line segments that meet at that angle. Then, rotate your paper 180 degrees, and repeat, ensuring that the new lines are parallel to the existing ones, and eventually intersect them. You now have a parallelogram.
The sum of all angles in a triangle is 180 degrees. with 90 degrees (the right angle) spoken for, that leaves 45 degrees each for the remaining two angles.
acute
No, 180 degrees is a straight angle. A reflex angle is one whose value is between 180 and 360 degrees.