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

Question

Responses

C=r
upper C equals r

C=2r
upper C equals 2 r

C=2d
upper C equals 2 d

C=r2

Answer 1

C=2πr
Circumference (C) equals 2 times pi (π) times the radius (r)