An acute angle.
An acute angle is defined as an angle that measures greater than 0° and less than 90°. In other words, any angle smaller than a right angle (90°) is considered acute. Examples of acute angles include 30°, 45°, and 60°.
An obtuse angle
An obtuse angle is any angle measuring more than 90° but less than 180°.
A right angle
A right angle is an angle formed when two lines meet so that they create a square corner.
It measures exactly 90 degrees, which is one-quarter of a full 360-degree rotation.
The symbol for a right angle is often a small square drawn at the vertex where the two lines meet.
A reflex angle
In geometry, an angle is formed by two rays with a common endpoint called the vertex. A reflex angle specifically refers to the angle that is larger than a straight angle (180°) but smaller than a full rotation (360°).
A straight angle
A straight angle is defined as an angle that is equal to 180 degrees. The reason it is called a straight angle is because it appears as a straight line. In other words, it is an angle whose sides lie in opposite directions from the vertex in the same straight line.
A revolution
A revolution angle refers to the angle corresponding to one complete turn or rotation around a circle, which equals 360 degrees.
A vertex
A vertex is a point where two or more lines, edges, or curves meet, commonly known as a corner or a node in various mathematical contexts.
