No. Given two points on a circle, the minor arc is the shortest arc linking them. The major arc is the longest.
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An angle of 180 degrees is a straight line.
An acute angle is lower than 90 degrees. An obtuse angle is higher than 90 degrees. But lower than 180 degrees. A right angle is exactly 90 degrees. A straight angle is exactly 180 degrees. A reflex angle is higher than 180 degrees. A Circle is exactly 360 degrees.
180 degrees
180 degrees is exactly half of a circle: thus a straight line.
If they're less than 180 degrees, they're obtuse angles. If more than 180 degrees, they're reflex angles. (Exactly 180 degrees is a 'straight' angle.)