Question

The diameter of a circle is 4 centimeters. what is the circumference in centemeters

Answer 1

12.56 if it asks to use 3.14, 4
`\pi` if it does not ask to use 3.14

Explanation:

If it asks to use 3.14

C=
`\pi d`

substitute
`\pi` with 3.14 and d with 4.

C=3.14*4

C=12.56

If it does not ask to use 3.14 your answer is 4
`\pi`

C=
`\pi d`

C=
`\pi 4`

C=4
`\pi`

Answer 2

C≈12.57

C=2πr

d=2r

C=πd=π·4≈12.56637cm