how do you find the area of a circle?

Answer 1

area = pi* (radius)^2

Answer 2

The circle is the infinite limit polygon. If we consider a equilateral polygon of n sides with a radius r from its center to any of the n vertices, its area is (nr^2)sin(2pi/n)/2.

So the area of a circle is [(r^2)/2]lim(n->infinity) nsin(2pi/n).

Since sin(2pi/n) --> 2pi/n as n--> infinity, the area goes to

[(r^2)/2](n)(2pi/n) = pi(r^2), the familiar equation.

Answer 3

A=π*r^2 where A is the area, r is the radius (1/2 the diameter) & π is a universal constant &
π=3.1415926535897932384626433832795.....

Answer 4

A = (pi) r^2

So multiply the radius times itself and then write the pi symbol next to the product to leave it "in terms of pi" or you can multiply the product times 3.14 for an approximate answer.

Answer 5

To find the area of a circle, memorize this equation:

3.14r^2

Take the radius and square it, then multiply by 3.14, or pi.

Answer 6

pi times r^2, where r is the radius

Answer 7

Square the radius and multiply by pi.

A = π r²
.

Answer 8

area of a circle is pi*radius^2
pi is 3.14159265358979323........

(Are you serious?)

Answer 9

πr^2 <= is the formula

Answer 10

A = π r²