Question

For a craft project, chris cut a circle out of a square of cardboard that was 7 centimeters on a side. if the circle was as large as possible and was all in 1 piece, what was its area, in square centimeters?

Answer 1

That's a long-winded way of saying the diameter of the circle is 7 cm, so the radius is 7/2 and the area is

$A = \pi r^2 = \pi(\frac 7 2)^2 = \dfrac{49\pi}{4} \textrm{ square cm}$