# Astronomy

Calculate the approximate circumference of Earths orbit around sun, assuming that orbit is a circle with radius of 1.5 X 10 to the eighth.

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1. What is 2PI*r?

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2. 150000000x3.14= 471,000,000

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posted by Kandice
3. Kandice, I would switch to scientific notation, it is so much easier to read.

circumferance=2*PI*1.5E8= 940 000 000=
= 9.4E8 units

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