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Read , learn and inwardly digest these two circle eq;n.s
C = 2 pi r or C = pi d
&
A = pi r^(2)
Very important when learning circular calculations.
Taking the first eq;n
C = 2 X pi X r
Where
C = circumference
2 is a constant
pi = 3.141592... ~=~ 3.14
r = radius.
NB The three terms on the RHS are MULTIPLIED TOGETHER>
What else can I help you with?
What is the radius of a circle of a circumference of 121?
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.
What is the circumference of a circle when the radius is 4 inches?
The formula for circumference of a circle is 2πr. Since the radius is 4, the circumference is 8π or approximately 25.12 inches.
Formula for circumference?
For a circle: circumference = 2 x π x radius. As the diameter of a circle is 2 x radius: circumference = π x diameter.
How do i work out the circumference of a circle from the radius?
The circumference of a circle with a known radius and can calculated using the following formula: C = 2Π(r)
Why would you use a formula to determine the circumference of a circle?
There is a constant relationship between the radius of a circle and its circumference. This is expressed in a formula.
What is the formula that relates circumstances and radius?
The formula that relates the circumstances (circumference) of a circle to its radius is given by ( C = 2\pi r ), where ( C ) is the circumference and ( r ) is the radius. In this formula, ( \pi ) (pi) is approximately equal to 3.14159. This relationship shows that the circumference is directly proportional to the radius, meaning as the radius increases, the circumference also increases.
How do you calculate radius when the have no radius and no diameter?
You use the information that you do have, and a formula that relates it to theradius or diameter of the circle. As an example: The circumference is very helpfulif you know it.
How do you determine the circumference of a circle if you know the radius?
use the formula pi*diameter = circumference and the formula diameter = 2*radius and combine them 2pi*radius = circumference now you have a formula that you can just plug you numbers into. if you have 3 as your radius, then this is how to find the circumference 2pi*3=circumference 6.28*3=circumference 18.84=circumference
What is the formula to calculate circumference using radius?
Circumference = 2*pi*radius
What is the formula for finding the circumference with radius?
the circumference is two times the radius, or 2r. so if the radius was 3, the circumference would be 6. if the radius was 4, the circumference is 8.
How do you get the radius of a circle from the circumfrance?
To find the radius of a circle when given the circumference, you should start with the formula for circumference, which is this: circumference = 2*pi*radius To solve for the radius, you would the have to divide the circumference by 2*pi leaving you with a formula like this: radius = circumference/(2*pi) pi≈3.14159
What formula is used to find the circumference when you know the radius?
Circumference=2*pi*radius
What is the circumference of a circle that has a radius of 6.74 in?
The circumference of a circle with a radius of 6.74 inches is approximately 42.34 inches. The circumference of a circle is found using the circumference formula: Circumference = 2 * π * radius So, all you have to do is plug in the radius into the formula, and approximate π to be 3.14159.
What is the formula to find circumference when you are given the radius?
To find the circumference of a circle the formula is: 2*pi*radius or diameter*pi
What is the formula for circumference using radius?
The formula for the circumference ( C ) of a circle using the radius ( r ) is given by ( C = 2\pi r ), where ( \pi ) is a mathematical constant approximately equal to 3.14159. This formula indicates that the circumference is directly proportional to the radius, meaning that as the radius increases, the circumference also increases.
What is the formula for finding the radius of a circle when you have the circumference?
Divide the circumference by 2*pi because 2*pi*radius = circumference
What is the radius of a circle of a circumference of 121?
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.
