Question

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julie is making a poster of the earth. she wants the earth to be a circle with a diameter of 10 inches. she wants to outline the earth with yarn. how many inches of yarn will julie need to outline the earth in her poster.
you may use 3.14 = pi

SHOW YOUR WORK!!!!!!!

it wants the circumference

Answer 1

You'd do pi * r squared.

so, multiply 10 * 10 then multiply the outcome by 3.14.

Answer 2

To find the circumference of a circle you use the formula C=2πr
r is the radius, the radius is half of the diameter so in this case half of 10 is 5. r=5
Now we we can plug in the values
C=2•3.14•5
C=31.4
The circumference is 31.3 in