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diameter of a circle

the diameter of a circle given the points: (0,11)(-4,7/2) 
and the radius 

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Jaudat R. | Tutoring for Math and Physics Tutoring for Math and Physics
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the distance formula is D = rad{((X2-X1)^2)+((Y2-Y1)^2)} . Just plugin the values of your x and y. Then the radius is half of the diameter, so divide your distance by 2 and that will be your radius of the circle.