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# 2D Coordinate Geometry

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

Given the line segment \( \overline{PQ} \) with \( P=(12,11) \) and \( Q=(8,5) \), the length of the line segment is \(a \).

What is \(a^2\)?

What is the distance between \( (4, 8 ) \) and the origin?

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