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  2. Fourth grade - Wikipedia

    en.wikipedia.org/wiki/Fourth_grade

    Fourth grade (also 4th Grade or Grade 4) is the fourth year of formal or compulsory education. It is the fourth year of primary school . Children in fourth grade are usually 9–10 years old.

  3. Perimeter - Wikipedia

    en.wikipedia.org/wiki/Perimeter

    A perimeter is a closed path that encompasses, surrounds, or outlines either a two dimensional shape or a one-dimensional length. The perimeter of a circle or an ellipse is called its circumference. Calculating the perimeter has several practical applications. A calculated perimeter is the length of fence required to surround a yard or garden.

  4. Cartesian coordinate system - Wikipedia

    en.wikipedia.org/wiki/Cartesian_coordinate_system

    For example, a circle of radius 2, centered at the origin of the plane, may be described as the set of all points whose coordinates x and y satisfy the equation x 2 + y 2 = 4; the area, the perimeter and the tangent line at any point can be computed from this equation by using integrals and derivatives, in a way that can be applied to any curve.

  5. Subtraction - Wikipedia

    en.wikipedia.org/wiki/Subtraction

    In what is known in the United States as traditional mathematics, a specific process is taught to students at the end of the 1st year (or during the 2nd year) for use with multi-digit whole numbers, and is extended in either the fourth or fifth grade to include decimal representations of fractional numbers.

  6. Special right triangle - Wikipedia

    en.wikipedia.org/wiki/Special_right_triangle

    Set square shaped as 45° - 45° - 90° triangle The side lengths of a 45° - 45° - 90° triangle 45° - 45° - 90° right triangle of hypotenuse length 1.. In plane geometry, dividing a square along its diagonal results in two isosceles right triangles, each with one right angle (90°, ⁠ π / 2 ⁠ radians) and two other congruent angles each measuring half of a right angle (45°, or ...

  7. Tales of a Fourth Grade Nothing - Wikipedia

    en.wikipedia.org/wiki/Tales_of_a_Fourth_Grade...

    Tales of a Fourth Grade Nothing is a children's novel written by American author Judy Blume and published in 1972. [1] It is the first in the Fudge series and was followed by Otherwise Known as Sheila the Great , Superfudge , Fudge-a-Mania , and Double Fudge (2002).

  8. Cyclic quadrilateral - Wikipedia

    en.wikipedia.org/wiki/Cyclic_quadrilateral

    Examples of cyclic quadrilaterals. In Euclidean geometry, a cyclic quadrilateral or inscribed quadrilateral is a quadrilateral whose vertices all lie on a single circle.This circle is called the circumcircle or circumscribed circle, and the vertices are said to be concyclic.

  9. Fourth Grade (South Park) - Wikipedia

    en.wikipedia.org/wiki/Fourth_Grade_(South_Park)

    "Fourth Grade" is the eleventh episode of the fourth season of the animated television series South Park, and the 59th episode of the series overall. It first aired on November 8, 2000. Written by Trey Parker, "Fourth Grade" focuses on the main characters' transition to the fourth grade, a change that would remain consistent in subsequent ...

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