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1. en.wikipedia.org › wiki › PiPi - Wikipedia

   en.wikipedia.org › wiki › Pi

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   Hace 1 día · The number π (/ p aɪ /; spelled out as "pi") is a mathematical constant that is the ratio of a circle's circumference to its diameter, approximately equal to 3.14159.The number π appears in many formulae across mathematics and physics.It is an irrational number, meaning that it cannot be expressed exactly as a ratio of two integers, although fractions such as are commonly used to ...

2. en.wikipedia.org › wiki › Energy_policy_of_the_United_StatesEnergy policy of the United States - Wikipedia

   en.wikipedia.org › wiki › Energy_policy_of_the_United_States

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   Hace 1 día · In February 2009, the American Recovery and Reinvestment Act was passed, with an initial projection of $45 billion in funding levels going to energy. $11 billion went to the Weatherization Assistance Program, the Energy Efficiency and Conservation Block Grant, and the State Energy Program, $11 billion went to federal buildings and vehicles, $8 billion went to research and development programs ...

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