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  2. Proportional reasoning - Wikipedia

    en.wikipedia.org/wiki/Proportional_reasoning

    In Piaget's model of intellectual development, the fourth and final stage is the formal operational stage.In the classic book "The Growth of Logical Thinking from Childhood to Adolescence" by Jean Piaget and Bärbel Inhelder formal operational reasoning takes many forms, including propositional reasoning, deductive logic, separation and control of variables, combinatorial reasoning, and ...

  3. Proportionality (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Proportionality_(mathematics)

    The variable y is directly proportional to the variable x with proportionality constant ~0.6. The variable y is inversely proportional to the variable x with proportionality constant 1. In mathematics, two sequences of numbers, often experimental data, are proportional or directly proportional if their corresponding elements have a constant ratio.

  4. Proportion (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Proportion_(mathematics)

    A proportion is a mathematical statement expressing equality of two ratios. [1] [2]: =: a and d are called extremes, b and c are called means.. Proportion can be written as =, where ratios are expressed as fractions.

  5. Circle - Wikipedia

    en.wikipedia.org/wiki/Circle

    A circle circumference and radius are proportional. The area enclosed and the square of its radius are proportional. The constants of proportionality are 2 π and π respectively. The circle that is centred at the origin with radius 1 is called the unit circle. Thought of as a great circle of the unit sphere, it becomes the Riemannian circle.

  6. WHO chief released from hospital in Rio de Janeiro - AOL

    www.aol.com/news/chief-hospitalized-rio-janeiro...

    World Health Organization chief Tedros Adhanom Ghebreyesus has been released from Rio de Janeiro's Hospital Samaritano Barra da Tijuca after spending the night under observation, the hospital said.

  7. Las Vegas already seems part of the NBA world, which makes ...

    www.aol.com/las-vegas-already-seems-part...

    LAS VEGAS (AP) — Milwaukee coach Doc Rivers has heard and seen enough. He's convinced there will be an NBA team in Las Vegas. “Yeah, they're going to get it,” Rivers said.

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