In a circle with a radius of 6, what is the area of the biggest rectangle that can be cut out of this circle ? Choose the correct choice from the following answers.
A) 12  B) 96  C) 50  D) 72  E) 144
The biggest rectangle would be a square, whose diagonal is 12 (6+6)   if side of square is a, 144=a^2+a^2=2a^2   so area of square=a^2=144/2= 
<gadget id="calculator">144/2</gadget>
<output>72</output>
72   ANSWER: 72
<result>D</result>
In a circle with a radius of 6, what is the area of the biggest rectangle that can be cut out of this circle ?