3.14159 but for school pupils 3.14 or even 22/7 will be sufficiently accurate.
Assuming you mean a circle, use the formula for the area of a circle, which is usually expressed in terms of the radius, and solve for the radius. Then you can multiply that by two to get the diameter, since the diameter is twice the radius.
circumference of a circle = pi * diameter.
Bob tried to find the diameter of the circle.
In a circle, the radius is half of the diameter.
Multiplying the diameter by pi (approx 3.1416) will give you the circumference of the circle.
To calculate this you will need the diameter of the circle. The formula is: diameter/2*pi If you don't know the diameter you can also use the area of the circle: Sqrt(Area/pi) = radius
They both use pi:- circumference = 2*pi*radius or diameter*pi area = pi*radius2
Assuming you mean a circle, use the formula for the area of a circle, which is usually expressed in terms of the radius, and solve for the radius. Then you can multiply that by two to get the diameter, since the diameter is twice the radius.
If you are given the radius of the circle, you can use the formula: diameter = 2*radius If you are given the circumference of the circle, you can use the formula: diameter = circumference/pi
To find area of a circle using diameter, you use this formuler. Area=pi(diameter/2)(diameter/2)
Oh, dude, math time! So, the formula for finding the diameter of a circle from the circumference is dividing the circumference by π (pi). In this case, 49 divided by π is approximately 15.57 centimeters. So, the diameter of the circle is around 15.57 centimeters. Easy peasy, right?
circumference of a circle = pi * diameter.
Bob tried to find the diameter of the circle.
In a circle, the radius is half of the diameter.
Multiplying the diameter by pi (approx 3.1416) will give you the circumference of the circle.
Divide the diameter by 2 to get the radius. Then use the standard formula for the area of a circle.
Circumference of a circle = pi*diameter or 2*pi*radius