An acute triangle.
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90 - 72 = 18 degrees.
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.
A regular 18 sided polygon has 18 exterior angles each measuring 20 degrees
Angles only go up to 360 degrees unless it's 1 and 1/36 of a revolution
Providing that it is a regular polygon then each interior angle will measure 160 degrees