Using 3.14 as Pi the area of circle is: 28.259999999999998
A=(pi)r^2
A = Area
pi = 3.14719....
r = radius
A=(pi)(3)^2= 9(pi)
The exact area is 9(pi) units^2, and the approximate answer is 27 units^2
A circle has only one measure for its radius. A shape that has a "radius" of 3 in by 4 in cannot be a circle.
A circle with a radius of 3 inches has an area of 28.27 square inches.
Area = pi*radius squared
9pi
28.26
A circle with a radius of 3 meters has an area of 28.27 square meters.
The area of a circle with a radius of 3 feet is: 28.27 square feet.
A circle with a radius of 3 cm has an area of 28.27 square cm.
A circle has only one measure for its radius. A shape that has a "radius" of 3 in by 4 in cannot be a circle.
A circle with a radius of 3 inches has an area of 28.27 square inches.
Area = pi*radius squared
If i do understand what u are saying then the equation is area=pi(radius^2) In this case it is 28=3.14(r^2) the radius is equal to 3 so the diameter is about 6. If i do understand what u are saying then the equation is area=pi(radius^2) In this case it is 28=3.14(r^2) the radius is equal to 3 (approx.) so the diameter is about 6.
18.84
9pi
29.6088132
28.26
Since you said radius, I assume you mean Circle or Sphere. Circle: Area = Pi * radius^2 therefore, Radius = Square Root of (Area/Pi). Sphere: Area = 4/3 Pi * Radius^3 therefore, Radius = CubeRoot of (3/4 * Area/Pi)