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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>
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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.
