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# 2D Coordinate Geometry

In the 1600s, René Descartes married algebra and geometry to create the Cartesian plane.

\((4, 5)\) is the midpoint between \((2, 1)\) and \((x, y).\) What is the value of \(xy?\)

Circle \(C\) has a center at \((2, 1)\) with a radius of 5. Which point could lie on the circle?

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