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How do you find the circumference of a circle if you have the diameter?

6 Answers
i have a new question which is : how do you find the circumference of a circle if you have the diameter?, thanks
C

If you have the diameter of a circle then the circumference can be found by multiplying the circumference by Pi. Pi is a mathematical constant equal to 3.142 (to 3 d p)

Example

A circle has a diameter of 15cm. Work out the circumference.

All you need to do is multiply the 15 by Pi:

3.142 x 15 = 47.1cm to 1 decimal place.

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W

The formula for the circumference of a circle is 2 x pi x radius.

Now since the diameter = 2 x radius,

The circumference is pi x diameter.

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S

Circulference = pi x diameter

pi = 3.14

if the diameter is 5, multiply 5 with 3.14 to get the circumference
circumference = 15.7

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O

Just multiply the diameter of the circle with PI(3.142)

If 'd' is the diameter of the circle then the circumference is = PI*d

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B

To get the circumference of a circle multiply the diameter by pi (3.14)

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K

To find the circumference multiply the diameter by pi.

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