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• Cyberchase: The Exact Center

The CyberSquad and Slider need to find the center of the circle and place the ring there in order to save Cyberspace. Inez and Jackie make a pattern of the circle using cloth and mark halfway points in each direction by folding the cloth evenly. Matt tests that they have marked the exact center by using his yoyo string to ensure ensure that every point on the edge is the same distance from the alleged center.

• Agora: Circles and Ellipses

Hypatia of Alexandria explains that the center of a circle is always the same distance from any other point of the circle. She also states that a circle is a special type of ellipse.

• Numb3rs: Inequality Bounding

In this clip, Charlie explains how to understand the connecting between a child molestor and his victim by looking at the intersection of the areas that each person uses. A very simple example is assuming that both the victim and perpetrator move in circles of radii r1 and r2 centered at (x1,y1) and (x2,y2).