Question

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

C=πr
𝐶
=
𝜋
𝑟

upper C equals r

C=π2r
𝐶
=
𝜋
2
𝑟

upper C equals 2 r

C=π2d
𝐶
=
𝜋
2
𝑑

upper C equals 2 d

C=πr2

Answer 1

C = 2πr

(Equivalently C = πd since d = 2r.)