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?
Four rods of equal length are hinged at their endpoints to form a
rhombus. The diagonals meet at X. One edge is fixed, the opposite
edge is allowed to move in the plane. Describe the locus of the
point X and prove your assertion.
A rectangular field has two posts with a ring on top of each post.
There are two quarrelsome goats and plenty of ropes which you can
tie to their collars. How can you secure them so they can't fight
each other but can reach every corner of the field?
A triangle ABC resting on a horizontal line is "rolled" along
the line. Describe the paths of each of the vertices and the
relationships between them and the original triangle.
Describe what happens if the triangle is not equilateral and
explain the outcomes you see.
Here are two examples for you.
Right Angle Triangle: