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Solve the Problem $( - 2,1 )$ And $( 4,9 )$ Find the Radius

Question 409

Multiple Choice

Solve the problem.
-A circle has a diameter with endpoints $( - 2,1 )$ and $( 4,9 )$ . Find the radius.

A) $\sqrt { 10 }$
B) $\sqrt { 5 }$
C) 5
D) 10

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