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  2. Right angle - Wikipedia

    en.wikipedia.org/wiki/Right_angle

    6 Rule of 3-4-5. 7 Thales' theorem. 8 Generalizations. 9 See also. 10 References. ... In geometry and trigonometry, a right angle is an angle of exactly 90 degrees or ...

  3. Right triangle - Wikipedia

    en.wikipedia.org/wiki/Right_triangle

    A right triangle ABC with its right angle at C, hypotenuse c, and legs a and b,. A right triangle or right-angled triangle, sometimes called an orthogonal triangle or rectangular triangle, is a triangle in which two sides are perpendicular, forming a right angle (1 ⁄ 4 turn or 90 degrees).

  4. 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 ...

  5. Law of cosines - Wikipedia

    en.wikipedia.org/wiki/Law_of_cosines

    Fig. 1 – A triangle. The angles α (or A), β (or B), and γ (or C) are respectively opposite the sides a, b, and c.. In trigonometry, the law of cosines (also known as the cosine formula or cosine rule) relates the lengths of the sides of a triangle to the cosine of one of its angles.

  6. Sine and cosine - Wikipedia

    en.wikipedia.org/wiki/Sine_and_cosine

    For the angle α, the sine function gives the ratio of the length of the opposite side to the length of the hypotenuse.. To define the sine and cosine of an acute angle , start with a right triangle that contains an angle of measure ; in the accompanying figure, angle in a right triangle is the angle of interest.

  7. Can the 90/90/1 Rule *Actually* Help You Achieve Your Goals ...

    www.aol.com/lifestyle/90-90-1-rule-actually...

    You could get closer to achieving those goals in just three months—according to the 90/90/1 rule, a self-improvement method created by leadership advisor, author and founder of global ...

  8. Proofs of trigonometric identities - Wikipedia

    en.wikipedia.org/wiki/Proofs_of_trigonometric...

    For example, the sine of angle θ is defined as being the length of the opposite side divided by the length of the hypotenuse. The six trigonometric functions are defined for every real number, except, for some of them, for angles that differ from 0 by a multiple of the right angle (90°). Referring to the diagram at the right, the six ...

  9. The 90-10 Rule is a Better Way to Trim Your Nails - AOL

    www.aol.com/lifestyle/90-10-rule-better-way...

    I once read an interview where Kim Kardashian mentioned that she always makes time for a manicure because even if everything else is in disarray, there’s something about having well-groomed ...