Introduction to Angles and Types of Angles

Angles are formed by the intersection of two lines. Lets us start with the learning of Introduction to Angles and Types of Angles.

Introduction to Angles

When two lines intersect, at the point of their intersection an angle is formed. The two rays that form the angle are known as the sides of the angle. Also, it is not necessary that an angle is formed by the intersection of two straight lines; it can be formed by the intersection of two curved lines too.

The parts of an angle are

Vertex – Point where the arms meet
Arms – Two straight line segments from a vertex
Angle – If a ray is rotated about its end-point, the measure of its rotation is called angle between its initial and final position

Introduction to Angles and Types of Angles
parts of angle

Type of angles

1. Acute angle
2. Right angle
3. Obtuse angle
4. Straight angle
5. Reflex angle
6. Full angle

Acute angle:

An angle which measures lie between 0 to 90 is called a acute angle.

Introduction to Angles and Types of Angles
Acute angle (always less than 90 degrees)

Right angle:

An angle which measures exactly 90 is called a right angle.

Introduction to Angles and Types of Angles
Right Angle

Obtuse angle:

An angle which measures lie between 90 to 180 is called a obtuse angle.

Introduction to Angles and Types of Angles
Obtuse angle ( always greater than 90 )

Straight angle:

An angle which measures exactly 180 is called a straight angle.

Introduction to Angles and Types of Angles
180 degree angle make straught line

Reflex angle:

An angle which measures lie between 180 to 360 is called a reflex angle.

Introduction to Angles and Types of Angles
reflex angle

Full angle:

An angle which measures exactly 360 is called a right angle.

Introduction to Angles and Types of Angles
full angle

Angle

Description

Acute Angle

angle between 0 and 90 degrees

Right Angle

exactly 90 degrees

Obtuse angle

angle between 90 and 180 degrees

Straight angle

exactly 180 degrees

Reflex angle

angle between 180 and 360 degrees

Full angle

exactly 360 degrees

Positive and Negative Angles

Positive angle: Angle measured counterclockwise from the base
Negative angle: Angle measured clockwise from the base

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