there is a circle of radius 5.what is the area of the biggest rectangle that can be cut out of this circle ?	Choose the correct choice.
A) 50
B) 60
C) 70
D) 80
E) 90
biggest rectangle would be a square,whose diagonal is 10(5+5)   if side of square is a, 100=a^2+a^2=2a^2   so area of square=a^2=100/2= 
<gadget id="calculator">100/2</gadget>
<output>50</output>
50   50NSWER:50
<result>A</result>
there is a circle of radius 5.what is the area of the biggest rectangle that can be cut out of this circle ?