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.
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.)
180 degrees
180 degrees is exactly half of a circle: thus a straight line.
An angle whose measure is exactly 180 degrees is a straight angle.
An angle of 180 degrees is a straight line.
Yes.
less than 180 degrees
a minor arc measures less than 180 degrees...
An arc whose measure is less than 180 degrees is called a Minor Arc.
Part of the circumference of a circle less than 180 degrees
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.
An angle with a measure of 180 degrees will look like a straight line with the vertex being a point in the center. Since a complete circle is 360 degrees, opening an angle to 180 degrees traces out exactly half a circle.
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.)
180 degrees
180 degrees is exactly half of a circle: thus a straight line.