A) 3
B) 4
C) 5/2
D) 7/2
Correct Answer: C
Extremities of diameter are (5, 7) and (1, 4) and radius is half of the distance between them
$ =\frac{1}{2}\sqrt{{{(4)}^{2}}+{{(3)}^{2}}}=\frac{5}{2} $ .
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