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OpenStudy (anonymous):
circle whose center is at (1, -3) passes through (7, 5). What is the length of the radius of the circle?
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OpenStudy (accessdenied):
The distance from the center to any one point on a circle is the same as the distance from the center to any other point on the circle, right? That is the circle's definition of a radius.
OpenStudy (accessdenied):
So the distance between those two points is the radius. We just need to apply a formula to obtain its length. The distance formula between two points. Makes sense?
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