Question

a paper airplane can be made out of two different pieces of paper: a circular piece 10 inches wide and a square piece 11 inches wide. Which piece of paper will provide the greater area for flight?

Answer 1

Compare the areas of the 2 different pieces of paper.

For the circle, the area is A=pi * r^2, which works out to A = pi(5 inches)^2.

For the square, the area is A = s^2, where is the side length, which here is 11 inches.

Finish these calculations, and then compare your two areas.  Which is the larger?