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OpenStudy (anonymous):
If you add the lengths of the focal radii of an ellipse, what other value will you produce? 2a 2b 2c The eccentricity I'm pretty sure it's 2a, but it's pretty much crucial that I get this correct!
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jimthompson5910 (jim_thompson5910):
You are correct. This page confirms it http://www.mathwords.com/e/ellipse.htm
OpenStudy (anonymous):
it produces the length of the major axis (2a)
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