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Sum of a Triangle's Interior Angles.

Author:
Greydon Little
Topic:
Angles
Move the points around to change the interior angles and see if you notice something special about all triangles:)
Can you make a right-angled triangle? Can you make an isosceles triangle? Can you make an equilateral triangle? Have you worked out what all triangles have in common in terms of the sum of their interior angles?

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