Topic: Properties of Angles and Shapes (Higher - Unit 3)

Candidates should be able to:

• work out the size of missing angles at a point
• work out the size of missing angles at a point on a straight line
• know that vertically opposite angles are equal
• distinguish between acute, obtuse, reflex and right angles
• name angles
• estimate the size of an angle in degrees
• justify an answer with explanations such as ‘angles on a straight line’, etc.
• use one lower case letter or three upper case letters to represent an angle, for example x or ABC 
• understand that two lines that are perpendicular are at 90^o to each other 
• draw a perpendicular line in a diagram
• identify lines that are perpendicular
• use geometrical language
• use letters to identify points, lines and angles

  Examples

  1. Three angles form a straight line. Two of the angles are equal. One of the angles is 30° more than another angle. Work out two possible values for the smallest angle.