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I have posted a link there to this topic so the OP can see my work.Math please help?????/?

What is the equation of this circle in standard form?

One end of the diameter is M (2,4) and the other end is N (9,4).

A. (x − 5.5)^2 + (y − 4)^2 = 7

B. (x + 5.5)^2 + (y + 4)^2 = 3.5

C. (x − 5.5)^2 + (y − 4)^2 = 3.5

D. (x + 5.5)^2 + (y + 4)^2 = 12.25

E. (x − 5.5)^2 + (y − 4)^2 = 12.25