it depends on the first two:
angle3 = 180 - angle1 - angle2
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An obtuse angle is an angle measuring between 90 and 180 degrees
A right angle triangle has 2 acute angles that add up to 90 degrees, along with 1 right angle of 90 degrees.
An isosceles triangle has two equal angles and one different angle. The sum of the angles in any triangle is always 180 degrees. Therefore, the two equal angles in an isosceles triangle must add up to 180 degrees minus the different angle. So, each of the two equal angles in an isosceles triangle measures (180 - x) / 2 degrees.
Any number from 1 to 178 degrees, on a flat surface. * * * * * The correct answer is any number in the open interval (0, 180). An angle can be 0.0001 degrees or 179.9999 etc.
Smallest possible interior angle of regular polygon is 60 degrees (triangle). The greater the number of sides, the greater each interior angle. If exterior angle is 30 degrees, the polygon has 12 sides.