The circumference is 37.68. explanation: formula of a circle: 2x3.14(pi)xradius so we know that the diameter is 12. in order to find the circumference, we need the radius. to find radius with the given diameter, you divide the diameter by 2. 12/2=6. using the formula for circumference, 2 x 3.14 x 6 = 37.68
