The 'closest' value of the area of a 3-inch circle is: 7.06858347 square inches.
If a circle's area is 3.14 (Pi), its radius is: about 1.
The radius of a circle is the distance from the center to an outside edge of the circle. The diameter is the distance all the way across the circle. Therefore, the radius is half the value of the diameter.
The radius of a circle has no bearing on the angular measure of the arc: the radius can have any positive value.
The radius is the distance from the center of the circle to its edge. No matter how you draw this radius, it is one value of one length only, for any given circle.
The circumference of a circle divided by the radius. (Works on any circle)
To find the radius of a circle with a circumference of 121, you can use the formula for the circumference of a circle: C = 2πr, where C is the circumference and r is the radius. Given that the circumference is 121, you can plug this value into the formula and solve for the radius. Dividing 121 by 2π will give you the radius of the circle, which is approximately 19.24 units.
Using 3.14 as Pi the area of circle is: 1384.74
Multiply 40 by the value of Pi and you have your answer.
1
Double the value of the radius which in this case is 2*20 = 40 feet
Area of a circle of radius r = πr2Area of circle of radius 9 In = π(9)2 = π x 81 , putting value of pi we get= 3.14159625 x 81 = 254.46 sq. In
The diameter is equal to half of the radius. So take the value of the diameter and divide it by two and that is your radius.