Science

In math, "pi" is equal to?

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What kind of power do sailboats use?
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What does the scientific acronym BTU stand for?
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Which abbreviation refers to a term that literally means "below red"?
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Which kind of tree is most often struck by lightning?
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What are the "Big Dipper" and "Orion" examples of in the night sky?
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What cellular structure found in the nucleus helps in protein formation?
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What protects our Earth from harmful rays?
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What is a space which is entirely devoid of matter called in science terms?
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