A thin piece of 40 m wire is cut in two. One piece is a circle with radius of r. Other is a square. No wire is left over. Which represents total area of circle and square in terms of r?
i get [spoiler]pir^2 + (40 - 2pir)^2[/spoiler] but oa is [spoiler]pir^2 + (10 - ½ pir)^2[/spoiler]