Dear student,

Any two rays that meet at a common end point is called an angle. Or in another words you can say that, angle can be defined as the geometrical figure formed by two rays meeting at a common end point.
Generally it is measured in degrees, and can be easily measured with a help of a protecter.

Now there are generally six types of angles :-

ACUTE ANGLE - Angle whose measure is between 0 and 90 degree.

Right angle - angle whose measure is exact 90 degree.

Zero angle - angle whose measure is exact 0 degrees.

Obtuse angle - An angle whose measure is greater than 90 degrees and less than 180 degrees.

Straight Angle - angle whose measure is exactly 180 degree.

Reflex angle - angle whose measure is greater than 180 degree and less than 360 degrees