A thin piece of wire 40 meters long is cut into two pieces. One piece is used to form a circle with radius r, and the other is used to form a square. No wire is left over. Which of the following represents the total area, in square meters, of the circular and the square regions in terms of r? (p=> Pi)

Hi!
Here is the answer to your question.
 
Let the radius of the circle and the side of the square be r and a respectively.
 
∴Circumference of circle + Perimeter of the square = 40 m
 
 
Cheers!

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