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When two lines intersect each other angles are formed. Angles are used in design work, architecture, building construction, astronomy, telling the time and art.   Angles can be named in many ways.           Protractors are used to measure angles.

 

Examples

 

Angle sizes range from greater than 0� to 360�. The six main angles are:	Diagram	Properties
acute		less than 90�
right		90�
obtuse		between 90� and 180�
straight		180�
reflex		between 180� and 360�
revolution		360�

 

 

Have a Go Problem 1 Draw  angles named: angle MZQ           Problem 2 Name the types of angles below that are labelled in  this drawing of a house.

 

Practice Questions Question 1 How many degrees in a quarter turn?   answer 90 degrees Question 2 How many degrees are marked on a protractor?   answer 180 degrees   Question 3 If angles meet at a point, then their sum is ? answer 360 degrees   Question 4 These two angles are formed when a right angle is divided into two parts. answer 90 degrees   Question 5 Any two angles whose sum is 180� are supplementary.  Name two pairs of supplementary angles in this diagram. answer angles B & C or angles A & D / angles B & A or angles C & D   Question 6 Any two angles whose sum is 90� are complementary.  Name two pairs of complementary angles in this diagram. answer angle A & angle B / angle D & angle E

 

 

 

 

 

 

Solution 1 back to Have a Go

Solution 2 back to Have a Go

 

 

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