This worksheet focuses on using the sum of angles in a triangle to find missing angles. It assumes that students are already familiar with angles on a straight line, vertically opposite angles, and angles in parallel lines.
The first section covers all the different types of triangles and their properties. There is a short exercise where students practise choosing the correct type(s) of triangle based on the information given.
The second section begins with the result for the sum of angles in a triangle, including a proof using angles on a straight line. There are then some examples of finding angles - these are to be completed with your class. The exercise that follows is for students to attempt themselves.
Answers to both exercises are included.
The first section covers all the different types of triangles and their properties. There is a short exercise where students practise choosing the correct type(s) of triangle based on the information given.
The second section begins with the result for the sum of angles in a triangle, including a proof using angles on a straight line. There are then some examples of finding angles - these are to be completed with your class. The exercise that follows is for students to attempt themselves.
Answers to both exercises are included.
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