1. Cut out a paper triangle.
2. Rip off the three corners
3. Arrange the three corners as shown.
4. What do you notice?
Triangle Angle Sum
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1. Cut out a paper triangle.
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2. Rip off the three corners
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3. Arrange the three corners as shown.
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4. What do you notice?
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Drag the vertices of the triangle below and notice the constant sum of the angles.
Applet created on 1/29/01 by Jim Dildine with CabriJava