What is the circumference of a circle with radius 9.43 mm?

Here is the answer to questions like: how to find the perimeter of a circle with radius 9.43 mm?

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Result:

The circumference of a circle with radius 9.43 is 59.25(*)

Formulas:

Image of Circle r = 9.43 d = 18.9 C = 59.3
C = 2·π·r
C = π·d
C = √4·π·A
π = 3.1415
A = area of the circle
C = circumference or perimeter
r = radius, d = diameter

Step-by-step Solution:

Circumference of a cicle in terms of radius:

Circumference = 2·π·r = 2·3.14·9.43 = 59.26(*)

In terms of diameter:

Circumference = π·d = 3.14·18.86 = 59.22(*)

In terms of area:

Circumference C = √4·π·A = √4·π·279.4 = 59.26(*)

(*) 59.25 mm exactly or limited to de precision of this calculator (13 decimal places).

Note: for simplicity, the operations above were rounded to 2 decimal places and π was rounded to 3.14.

Use the this circumference length calculator above to find the perimeter of a circle given its radius, or other parameters.

Formula to calculate the circumference of a circle

Here a three ways to find the circumference or perimeter of a circle:

Circumference length formula in terms of radius

C = 2·π·r

Circumference length formula in terms of diameter

C = π·d

Circumference length formula in terms of area

C = √4·π·A

Questions this calculator can answer:

  • How to find the perimeter of a circle with a radius of 9.43 mm?
  • A circle has a diameter of 18.86 mm. What is its circumference?
  • If a circle has a area of 279.4 square millimeters. What is its perimeter?

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