A straight line of 180 degrees
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An obtuse angle
It is an obtuse angle because it is greater than 90 but less than 180 degrees
A straight angle has 180 degrees. It is an angle that has sides in opposite directions from its vertex. A straight angle will look like a straight line.
A 140 degree angle is about half way between a 90 degree angle, which has lines that are perpendicular to each other, and a 180 degree angle, which is a straight line. A 140 degree angle is an obtuse angle which has a line a little over half way between the 90 degree and 180 degree angles.
I'm assuming that you mean an obtuse angle. An obtuse angle is greater than 90 degrees but less than 180 degrees. Therefore an obtuse angle is larger than a right angle, but less than a straight angle.