Maths

Angles

In this introduction we will quickly review angles.

Angles are easy to use if you learn the basics about them. To measure an angle we look at how far a line has travelled from a certain point. Some angles have special names! Here they are:  When the line gets back to its start point that is 360 degrees.

Now, remembering the rules we have just gone through can you name the type of angles that have the following measurements?

 Number of degrees Type of angle Reason 30 Acute < (less than) 90 degrees 60 120 170 90 270 45

How did you do?

 Number of degrees Type of angle Reason 30 Acute < (less than) 90 degrees 60 Acute < (less than) 90 degrees 120 Obtuse > (greater than) 90 degrees 170 Obtuse > (greater than) 90 degrees 90 Right angle = 90 degrees 270 Reflex >(greater than) 180 degrees 45 Acute < (less than) 90 degrees

Well that is it for today. I hope this quick session refreshes your memory.
Next time we look at angles we will look at angles in triangles and other shapes.
Good luck!