whats the formula for the area of a circle?
http://www.mathgoodies.com/lessons/vol2/circle_area.html
The formula for the area of a circle is A = πr^2, where A represents the area and r represents the radius of the circle. To find the area of a circle, follow these steps:
1. Measure the radius (r) of the circle. The radius is the distance from the center of the circle to any point along its circumference.
2. Square the radius value by multiplying it by itself (r^2).
3. Multiply the squared radius value by π (pi). Pi is an irrational number approximately equal to 3.14159, commonly represented by the Greek letter π.
4. The result of the above calculation is the area (A) of the circle.