What is the exact circumference of a circle with a diameter of 21 inches?
Is it 110.25p inches??
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circumference of a circle
When you see list of results go on wikipedia.
C = circumference
d = diameter
C = d*pi
C = 21*3.14159
C = 65.97339 in
Circumference = 2πr or dπ with d as diameter
so circumference = 21π
(it asked for "exact" circumference , so the answer has to be left in terms of π )
To find the exact circumference of a circle with a diameter of 21 inches, we can use the formula for the circumference of a circle, which is C = πd, where C is the circumference and d is the diameter.
Given that the diameter is 21 inches, we can substitute this value into the formula:
C = π * 21
Now we can calculate the exact circumference:
C = 21π
The exact circumference of a circle with a diameter of 21 inches is 21π inches, which is approximately 65.973 inches.
To find the circumference of a circle, you can use the formula: C = πd, where "C" represents circumference, "π" is a mathematical constant approximately equal to 3.14159, and "d" represents the diameter of the circle.
In this case, the diameter is given as 21 inches.
So, to find the circumference, we can substitute the value of the diameter into the formula:
C = πd
C = 3.14159 * 21
Calculating this, we get:
C ≈ 65.97339 inches
Rounded to the nearest hundredth, the circumference of a circle with a diameter of 21 inches is approximately 65.97 inches, not 110.25π inches.