In this activity you will discover an important property about the three angles in a triangle. The triangle below can be modified by moving any vertex.
Activity:
1) Move the vertices of this triangle to generate many other triangles of different forms and sizes.
2) For each triangle, add the measures of the three angles.
3) Round each sum to the nearest whole number.
4) What did you notice?
5) What is the relationship between the three angles of any triangle?
Conclusion
The sum of all angles in any triangle is 180 degrees.
This Angles in a Triangle Activity was created with GeoGebra by Doina Popovici.
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