An obtuse angle because 98 degrees is greater than 90 but less than 180 degrees
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180-98=82 degrees so that is the supplement.Geometry tells us that two angles are supplementary if their sum is 180 degree. to find out the supplement of 82 degree we subtract: 180-82= 78 degree. Answer: the supplement of 82 degree is 78 degree.
An equilateral triangle has 3 equal angles of 60 degrees that add up to 180 degrees
The interior angles of a regular octagon are each 135 degrees.
The sum of the measures of the interior angles is (n-2)*180 degrees, where n is the number of sides. Thus, if the sum of the interior angles is S, then n = S/180 + 2