angle-sum-foldTake any triangle and label it ABC with A as the largest angle. Fold the triangle along PQ, PS and QT where the points P and Q are the midpoints of AB and AC and PS and PT are perpendicular to BC.

What do you notice? Why does this happen? Will it happen for all triangles? If so can you prove it? Does the folding experiment tell you anything else about triangles?

Click here for Notes for Teachers.

 

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