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  2. Area of a circle - Wikipedia

    en.wikipedia.org/wiki/Area_of_a_circle

    The area of a regular polygon is half its perimeter multiplied by the distance from its center to its sides, and because the sequence tends to a circle, the corresponding formula–that the area is half the circumference times the radius–namely, A = ⁠ 1 2 ⁠ × 2πr × r, holds for a circle.

  3. Mathematics - Wikipedia

    en.wikipedia.org/wiki/Mathematics

    So, an area of study can be qualified as mathematics as soon as one can prove theorems—assertions whose validity relies on a proof, that is, a purely-logical deduction. [178] Others take the perspective that mathematics is an investigation of axiomatic set theory, as this study is now a foundational discipline for much of modern mathematics.

  4. Pi - Wikipedia

    en.wikipedia.org/wiki/Pi

    The area of the circle equals π times the shaded area. The area of the unit circle is π. π appears in formulae for areas and volumes of geometrical shapes based on circles, such as ellipses, spheres, cones, and tori. Below are some of the more common formulae that involve π. [149] The circumference of a circle with radius r is 2πr. The ...

  5. Teachers Share 46 Differences They See In Kids In 2024 From ...

    www.aol.com/teachers-share-46-differences-see...

    Present: class of 20: 5-7 behavior problems, one of those a major problem, 7 -8 unmotivated and uninterested kids. 5-7 hard working kids that want to learn. Most parents not involved. Image ...

  6. Power of a point - Wikipedia

    en.wikipedia.org/wiki/Power_of_a_point

    In elementary plane geometry, the power of a point is a real number that reflects the relative distance of a given point from a given circle. It was introduced by Jakob Steiner in 1826. [ 1] Specifically, the power of a point with respect to a circle with center and radius is defined by. If is outside the circle, then , if is on the circle ...

  7. Circle - Wikipedia

    en.wikipedia.org/wiki/Circle

    The circle is a highly symmetric shape: every line through the centre forms a line of reflection symmetry, and it has rotational symmetry around the centre for every angle. Its symmetry group is the orthogonal group O (2, R ). The group of rotations alone is the circle group T. All circles are similar.

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