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All in the Mind

Imagine you are suspending a cube from one vertex (corner) and allowing it to hang freely. Now imagine you are lowering it into water until it is exactly half submerged. What shape does the surface of the water make around the cube?

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Rotating Triangle

What happens to the perimeter of triangle ABC as the two smaller circles change size and roll around inside the bigger circle?

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Is There a Theorem?

Draw a square. A second square of the same size slides around the first always maintaining contact and keeping the same orientation. How far does the dot travel?


Stage: 3 Challenge Level: Challenge Level:3 Challenge Level:3 Challenge Level:3
An additional challenge here is to show that the inscribed polygon is a parallelogram. Invite students to make conjectures about the shape of this quadrilateral and then to prove their conjectures.