500 thousandths is equal to five tenths. Thus, we have a five in the tenths place and an eight in the hundredths place, so we have .58 as our answer.
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Circumference = 2πr or πd
The formula for circumference is 2πr (2 times pi times the radius)
2r = d (The radius x 2 = the diameter), so the circumference also = πd (pi times the diameter)
It is -72 lol. that's pretty basic you know