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OpenStudy (anonymous):
A circle has it's center at the origin, and (5,-12) is a point on the circle. How long is the radius of the circle?
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OpenStudy (anonymous):
radius = distance from (5, 12) to (0, 0) = √(5²+12²) = √(25+144) = 13
OpenStudy (anonymous):
Use the distance formula. Distance Formula = √( (x2 - x1)² + (y2 - y1)² )
OpenStudy (anonymous):
In this case you x1 and y1 should be 0.
OpenStudy (anonymous):
Understood?
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