Science

In math, "pi" is equal to?

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What is a spacecraft that orbits planets, moons or other large space objects called?
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Which Apollo mission was launched on April 11, 1970?
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What nearly colorless gas is a form of ozone?
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What is a collection of different types of tissue to perform a specific function?
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What is a huge river of ice called?
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John Glenn was the first American to orbit the earth, in how long a flight?
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What is caused when the Moon moves into the Earth's shadow?
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What is the third brightest object in the Earth's sky?
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