Respuesta :

Circumference = πD

πD = 49π

D = 49

Radius = Diameter ÷ 2 = 49 ÷ 2 = 24.5

Answer: 24.5 units
Circumference = π · d 

49 = diameter
π = pi

Radius = Half of diameter

Divide radius by 2:

49 ÷ 2 = 24.5

Answer = Radius is 24.5

~Hope this helped~