26+ A 180 Degree Angle Consists Of A Single Ray Background. A straight angle is nothing but a mixture of an obtuse angle and acute angle on a line. These two angles and the final angle $\angle acb$ form a straight angle on $x$, which is always $180 duplicate it and slide the copy horizontally until the two triangles touch only at a single point.

Thus, the sum of all the angles of a triangle is 180°.

The angle which measures 180 degrees is called a straight angle. Notice that <)aec is greater than 0. Angles that are exactly 90 degrees are called right angles, while those that are between 0 and 90 degrees once an angle is larger than 180 degrees, it is categorized as a reflex angle. Find an angle that is positive, less than 360°.