need help with a math formula

i have a problem, Sally's art project is in the shape of a circle. She wants to put a piece of glitter string around the adge of her project. if her project has a radius of 4 inches, how much string will she need?

I have done it twicw and gotten 2 different answers one 16 than 8 just need for some one to show how thanks

Re: need help with a math formula

Please tell us exactly **what** you did and how you got those two answers. You appear to be saying that the string is going around the **circumference** of the circle. Is that correct? Do you know a formula for the circumference of a circle?

(If the string **is** on the circumference of the circle, neither 16 nor 8 is even close to the correct answer.)

Re: need help with a math formula

Length of string required is same as perimeter of circle

= 2πr

= 2 × 3.14 × 4 = 25.12 inch

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