Use transformations to determine whether the parallelograms are congruent.

Visualize the locus of points equidistant from a point (the focus) and a line (the directrix).

Visualize the locus of points whose sum of distances to two given points (the foci) is constant.

Discover properties of vertical angles.

Discover the relationship between a circle's central and inscribed angles.

Name a central angle using its vertex point and points on its sides; name an inscribed angle.
Write down at least two things you noticed when you moved point D around.
Write down at least two things you wonder about this experiment.
Make a conjecture about the relationship between an inscribed angle and its central angle.

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