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  2. Square root of 3 - Wikipedia

    en.wikipedia.org/wiki/Square_root_of_3

    (√ 7 is not possible due to Legendre's three-square theorem.) This projection of the Bilinski dodecahedron is a rhombus with diagonal ratio √ 3. The square root of 3 can be found as the leg length of an equilateral triangle that encompasses a circle with a diameter of 1.

  3. Equilateral triangle - Wikipedia

    en.wikipedia.org/wiki/Equilateral_triangle

    The area of an equilateral triangle with edge length is =. The formula may be derived from the formula of an isosceles triangle by Pythagoras theorem: the altitude of a triangle is the square root of the difference of squares of a side and half of a base. [3]

  4. Square root of 6 - Wikipedia

    en.wikipedia.org/wiki/Square_root_of_6

    A regular octahedron with an inscribed sphere, illustrating the square root of 6 ratio between edge length and radius Root rectangles illustrate a construction of the square root of 6 An equilateral triangle with circumscribed rectangle and square; the side of the square is (+) /, and the diagonal of the rectangle is the square root of 7.

  5. 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 ...

  6. Constructible number - Wikipedia

    en.wikipedia.org/wiki/Constructible_number

    The square root of 2 is equal to the length of the hypotenuse of a right triangle with legs of length 1 and is therefore a constructible number. In geometry and algebra, a real number is constructible if and only if, given a line segment of unit length, a line segment of length | | can be constructed with compass and straightedge in a finite number of steps.

  7. Exact trigonometric values - Wikipedia

    en.wikipedia.org/wiki/Exact_trigonometric_values

    The values of sine and cosine of 30 and 60 degrees are derived by analysis of the equilateral triangle. In an equilateral triangle, the 3 angles are equal and sum to 180°, therefore each corner angle is 60°. Bisecting one corner, the special right triangle with angles 30-60-90 is obtained. By symmetry, the bisected side is half of the side of ...

  8. Square root of 7 - Wikipedia

    en.wikipedia.org/wiki/Square_root_of_7

    The rectangle that bounds an equilateral triangle of side 2, or a regular hexagon of side 1, has size square root of 3 by square root of 4, with a diagonal of square root of 7. A Logarex system Darmstadt slide rule with 7 and 6 on A and B scales, and square roots of 6 and of 7 on C and D scales, which can be read as slightly less than 2.45 and ...

  9. File:Equilateral triangle with height square root of 3.svg

    en.wikipedia.org/wiki/File:Equilateral_triangle...

    File:Equilateral triangle with height square root of 3.svg. ... English: Demonstrates how the square root of 3 is given to the height of an equilateral triangle.