Question

Find the circumference of circle with 2.5 diameter

Answer 1

`2.5\pi`

Explanation:

Since we know the diameter (d), we can find the radius (r):

`r = (1)/(2) * d = (1)/(2) * 2.5 = 1.25`

And not we can find the circumference:

C=
`2\pi * r = 2 * \pi * 1.25 = 2.5\pi`

Answer 2

7.85

Explanation:

Using the formulas

C=2πrd=2r

Solving forC

C=πd=π·2.5