Question

What is the circumference of the following circle?

Use 3.14 for \piπpi and enter your answer as a decimal.

Answer 1

21.98 cm

Explanation:

The circumference formula is
`2\pi r` which can be expressed as
`\pi d`, where r is radius and d is the diameter length.

Since we know the diameter is 3 cm, that means we can plug in that value for d and get
`7 \pi` as the circumference

However, the question tells us to use 3.14 for
`\pi`, so we must find the value of
`7 * 3.14`. By doing mental math or by using a calculator we can find this value to be 21.98.

Thus, the circumference of the circle is 21.98 cm

Answer 2

9.42cm

Explanation:

according to fig :

diameter (d) =3cm so ,

radius (r) = d/2 =3/2 = 1.5cm

solution:

as we know that ,

circumference of a circle = 2πr

=2×3.14×1.5

=9.42 cm