# The diameter of the earth at the equator is 800 miles calculate the circumference of the earth at the equator Using 4(8/9)²

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The circumference of a circle is its diameter multiplied by pi.

You're using pi = 4(8/9)^2

So the circumference would be 800*4*(8/9)^2 = **2528 miles**

But since the diameter is rounded to the hundreds, 2500 would be a good answer.