Sort the Angles: Accute or Obtuse

In this activity, we will be spotting different types of angles.  There are 3 types of angles that we will be looking for and we are going to share the tips for doing so!

 

Have you heard of these terms before?

ACUTE - This is an angle that is less than 90°.  (This is the symbol for the word degree) 

(Sneaky tip - If someone is called 'cute' this could be because they are little!)

 

 

OBTUSE -  This is an angle that is more than 90° (a right angle) but less than 180° (a straight line).

 

 

RIGHT ANGLE - This is an angle that is exactly 90 °.

(There are many everyday objects that have a 90° angle, think about the corner of your ruler this is 90° and can be used as a quick angle checker, by holding it to where the 2 lines meet)

 

Example

Sort the angles into acute and obtuse.

 

(a) (b) (c)

 

 

(d) (e) (f)
 

 

 

Answer

Acute angles: c, d, e.  

These are less than 90° (a right angle)

 

Obtuse angles: a, b, f.  

These are more than 90° (a right angle) but less than 180° (a straight line)