  Angles of a TriangleIn this puzzle, you will arrange sectors to show external angles and internal angles. Internal angles are angles that are found on the inside of polygons. When the puzzle is solved, the red sectors show the external angles and the blue sectors show the internal angles. When you solve the puzzle, can you see how the external and internal angles are supplementary? If you're not sure what you're supposed to do, click the "show me how" button. When you're ready to play, click "my turn". You can move the red and blue sectors by dragging them into place. See what happens when you click "drive it". How much does the turtle turn each time it turns a corner?
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Turns and Sectors
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