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Angles
Whenever two lines intersect at a common point, they form an angle between the point of contact.
The two lines from the point of contact are called ‘sides’ of the angle.
Sides of the
angles
Angle
formed
Point of
Contact
Types of Angles
The amount of space between the sides of an angle determines how big the angle is. They are
measured in ‘Degrees’. An angle of ‘0' degrees will have both sides on top of each other.
The highest degree of angle possible is 360. That’s when the first side turns around to meet the
second side.
1. Acute angles
When an angle measures less than 90 degrees, it is called an ‘Acute’ angle.
In the image, lines AB and BC form an angle ABC at the point of contact B which measures 45 degrees.
Hence, angle ABC is an acute angle.
°
2. Right angles
When an angle measures exactly 90 degrees, it is called a ‘Right’ angle. A right angle is a straight
line fixed upright over a flat horizontal line.
In the image, lines AB and BC form an angle ABC at the point of contact B which measures 90 degrees.
Hence, angle ABC is a right angle.
°
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