How can I understand geometry in order to calculate the length of a circle?

label Mathematics
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Oct 30th, 2015

Thank you for the opportunity to help you with your question!

A secant to a circle is a line that intersects the circle at two points. The answer is A.

This is because it is a line and not a segment like CE which intersects at two points but does not stretch to infinity in either direction.

Please let me know if you need any clarification. I'm always happy to answer your questions.
Oct 30th, 2015

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