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Math·Algebra·Linear equations in one variable

hard

A rectangle is inscribed in a circle, such that the diagonal of the rectangle is twice the length of its shortest side. The area of the circle is $3,969\pi$ square units. What is the perimeter, in units, of the rectangle?

A

$126+126\sqrt{2}$

B

$126+126\sqrt{3}$

C

$378$

D

$3,969$