2π
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A solid angle is 3-dimensional, a planar angle is 2-d.
An angle that is 139 degrees would be considered an "obtuse" angle. This is because it is over 90 degrees and does not exceed 180. Anything below 90 would be considered "acute" while anything above 180 would be considered a "reflex" angle.
Well, isn't that a happy little angle we have here! 99 degrees is an acute angle, which means it's less than 90 degrees. It's like a tiny slice of sunshine in the big sky of angles, just waiting to bring joy to your geometric world.
the cone has three sides
It is: "angle a is not a right angle" or "angle a is greater than or less than a right angle".