There is a circle of radius 2. What is the perimeter of the biggest rectangle that can be cut out of this circle?  Answers.
A) 4âˆš8
B) 4âˆš5
C) 2âˆš6
D) 16
E) 5
The largest rectangle to be cut out of a circle would be a square, with a diagonal of 4 (Radius*2 2*2=4)   Using the Pythagorean theorem a^2+b^2=c^2; in a square this is 2a^2 because this is a right triangle/half of a square, so 2a^2=4^2   2a^2=16   a^2=8   a=âˆš8   4âˆš8rea of a square = side * 4 so perimeter= 4âˆš8   4âˆš8nswer is 4âˆš8
<result>A</result>
There is a circle of radius 2. What is the perimeter of the biggest rectangle that can be cut out of this circle?