Angle sum of a triangle
Learning objective: To discover the angle sum of any triangle
Work through the investigation and answer the questions.
Have you ever used Geogebra before?
Introduction to Geobebra for teachers
Your Task
Move the points around to create triangles with the following qualities:
(i) acute-angled
(ii) obtuse-angled
(iii) right-angled
(iv) equilateral
(v) isosceles
As you do this, make a note of the angle sum of the different triangles.
Write down your thoughts.
What can you say about the sum of all the angles of triangles?