An obtuse angle.
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It's quite acceptable to call it a 20-agon but knowing its properties is more important which are:- Interior angles add up to 3240 degrees Exterior angles add up 360 degrees It has 170 diagonals It consists of 18 triangles
As 170 degrees is greater than 90 degrees, but less than 180 degrees, the angle is obtuse.
Exterior angles add up to 360 degrees Interior angles add up to 720 degrees
explementary angles add up to 360 degrees supplementary angles add up to 180 degrees complementary angles add up to 90 degrees
A right angles triangle, as one of the angles in the triangle is 90 degrees.