What is the circumference of a circle if the diameter is 18 cm?

Answer 1

to find circumference of a circle the equation to use is: 3.14 multiplied by diameter

so 3.14 * 18 =56.52

THE FORMULA FOR CIRCUM OF A CIRCLE =II(pie)r2

the diameter is=18

...THE RADIUS =18/2 =9 CM

=II 92

=81 II CM2

IN WORDINGS EIGHTY ONE PIE SQUARE CM

Another Answer

The formula given above is for the area of a circle. The circumference of a circle whose diameter is known is obtained from the definition of pi, namely, the ratio of the circle's circumferene, C, to its diameter, D.

pi=C/D so C=(pi)D =(3.14)(18cm)=56.55cm Rounded

isn't there a more simple formula?????????????????????????????????