That angle was called 'revolution'.
A 180 Degree angle therefore a straight line.
acute
Complementary angles sum to give 90 degrees. Therefore the complement to an 85 degree angle is a 5 degree angle.
an acute angle
That angle was called 'revolution'.
180 degree angle.
It is a reflex angle.
A 180 Degree angle therefore a straight line.
Any two angles whose sum is equal to 90 degrees are called "complementary angles".
An angle whose degree measure is between 0 and 90 is an acute angle. An angle whose degree measure is between 90 and 180 is an obtuse angle. These are basic properties of geometry.
An obtuse angle
It is an angle whose measure is 144 degrees!
180 degree angle or a straight angle
It is an angle whose measure is 83/180th of a turn,
It is an angle whose measure is 1/180th of a turn,
Less than 90 degrees is an acute angle, a 90 degree angle is a right angle, and an angle greater than 90 degrees is called an obtuse angle.