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
![Image](https://stage.geogebra.org/resource/rbnzjgyb/uxT3CLRPkULxEKDm/material-rbnzjgyb.png)
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?