How can I understand geometry in order to solve the following?

Mathematics
Tutor: None Selected Time limit: 1 Day

Oct 31st, 2015

hello


area of circle = π* radius^2

 75   =  π* radius^2

radius^2 = 75 / π

radius^2 = √23.873

radius = 4.89.............answer


ANSWER IS option D

D. 4.89



hope you understood..please message if you have any doubts...thank you
Oct 31st, 2015

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