How do you figure square inches for a circle?

Answer 1

πr^2

π is pi, a constant whose value is commonly rounded to 3.14, or for greater accuracy, 3.14159, though in truth the decimal places are infinite

r^2 is the radius (r) of the circle to the second power; this mathematical procedure is called squaring a number, which in this case would be "r squared;" the unit of measurement used to describe r will be the unit of measurement describing the area of the circle, thus a radius measurement in centimeters would have to first be converted to inches if the desired outcome is square inches