Math > Year 3

Angles and Turns

Angle
An angle is formed when two straight lines meet at a point. 

 

For example,



 

 

Here, line A meets line B at point C. It makes an angle there.

An angle is represented by the symbol ‘’ and is measured in ‘degrees or °.
 

 

Right angle
 

When two straight lines meet each other, they form a right angle.

It is represented by a small square at the point where the lines meet.
 

 

Example,
 


 

The measure of a right angle is 90°.


 

Quarter Turn

Turn from the yellow line to the orange line is a quarter turn.

 


 

One-quarter turn is the same as one right angle.
 

 

Half turn

Turning the from yellow line to the green line is a half turn.
 


 

Two quarter turns or two right angles make one-half turn.

 

Three quarter Turn

Turning from the yellow line to the blue line is called the three-quarter turn.


 

Three right angles make a three-quarter turn.


 

Clockwise and Anti-clockwise 

 


Clockwise
Clockwise means turning the same way the hands on a clock.

 



 

Anti-clock wise

Anti-clockwise means turning the opposite way in the directions of the hands on a clock.
 

 


 

 

Let’s try a question.

If the hour hand of the clock takes a clockwise quarter turn, what time will be shown by the clock?

 


 


Solution:

 


 

The hour hand will be at 6.

 


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