The diameter and the  circumference of the circle  is 16 cm and  50.272 cm respectively
Step-by-step explanation:
What is the diameter and circumference?
Given that, Radius (R) = 8cm
             = 3.142
Diameter of the circle (D) = 2*R ==> Â 2 x 8 cm = 16 cm
Circumference of circle  (C) = 2R ==> 2 x 3.142 x 8 = 50.272 cm