Match each circumference to the corresponding radius or diameter of the circle. (All circumferences are approximate.) Tiles circumference: 34.54 units circumference: 59.66 units circumference: 23.236 units circumference: 26.376 units circumference: 13.188 units circumference: 29.83 units Pairs radius: 4.2 units diameter: 7.4 units diameter: 11 units radius: 9.5 units

We solve for the diameters of radius of the given circles by using the equation,

C = πD

or C = 2πr

where D and r are diameter and radius, respectively.

Solving,

C = 34.54 units

D = C/π = 34.54 units / 3.14 = 11 units

r = C / 2π = 34.54 units/2 (3.14) = 5.5 units

C = 59.66 units

D = C/π = 59.66 units/3.14 = 19 units

r = D2 = 9.5 units

C = 23.236 units

D = 23.236 units/3.14 = 7.4 units

r = D/2 = 3.7 units

C = 23.376 units

D = 23.376 units / 3.14 = 7.4 units

r = D/2 = 3.7 units

C = 13.188 units

D = 13.188 units/3.14 = 4.2 units

r = D/2 = 2.1 units