Question

Which formula is used to find the circumference of a circle when the radius is given?(1 point)
Responses

C=π2r
𝐶
=
𝜋
2
𝑟
upper C equals 2 r

C=πr2
𝐶
=
𝜋
𝑟
2
upper C equals r squared

C=πr
𝐶
=
𝜋
𝑟
upper C equals r

C=π2d

Answer 1

The correct formula to find the circumference of a circle when the radius is given is:

**C = 2πr**

So, none of the given responses are correct. However, you can use the diameter (d) to express the circumference, which is:

**C = πd**

where \( d = 2r \). If you want to specify in terms of radius, it should be \( C = 2πr \).