Answer:81.64cm
Step-by-step explanation:You have to use the formula it gives you which is, C=2(pie)r. It also tells you to use 3.14 as (pie). Therefore, that brings the formula down too C=2(3.14)r. R stands for the radius of a circle which it gives you (13 cm). So now you are left with C=2*(3.14)*13. Plug in your calculator and there is your answer!