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  2. Inverse Pythagorean theorem - Wikipedia

    en.wikipedia.org/wiki/Inverse_Pythagorean_theorem

    In geometry, the inverse Pythagorean theorem (also known as the reciprocal Pythagorean theorem [1] or the upside down Pythagorean theorem [2]) is as follows: [3] Let A, B be the endpoints of the hypotenuse of a right triangle ABC. Let D be the foot of a perpendicular dropped from C, the vertex of the right angle, to the hypotenuse. Then

  3. Inverse trigonometric functions - Wikipedia

    en.wikipedia.org/wiki/Inverse_trigonometric...

    Trigonometric functions of inverse trigonometric functions are tabulated below. A quick way to derive them is by considering the geometry of a right-angled triangle, with one side of length 1 and another side of length , then applying the Pythagorean theorem and definitions of the

  4. List of trigonometric identities - Wikipedia

    en.wikipedia.org/wiki/List_of_trigonometric...

    This can be viewed as a version of the Pythagorean theorem, and follows from the equation + = for the unit circle. This equation can be solved for either the sine or the cosine: This equation can be solved for either the sine or the cosine:

  5. Pythagorean theorem - Wikipedia

    en.wikipedia.org/wiki/Pythagorean_theorem

    In mathematics, the Pythagorean theorem or Pythagoras' theorem is a fundamental relation in Euclidean geometry between the three sides of a right triangle.It states that the area of the square whose side is the hypotenuse (the side opposite the right angle) is equal to the sum of the areas of the squares on the other two sides.

  6. Proofs of trigonometric identities - Wikipedia

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

    The oldest and most elementary definitions are based on the geometry of right triangles and the ratio between their sides. The proofs given in this article use these definitions, and thus apply to non-negative angles not greater than a right angle. For greater and negative angles, see Trigonometric functions.

  7. Optic equation - Wikipedia

    en.wikipedia.org/wiki/Optic_equation

    The optic equation with squares appears in the inverse Pythagorean theorem (red) The optic equation, permitting but not requiring integer solutions, appears in several contexts in geometry . In a bicentric quadrilateral , the inradius r , the circumradius R , and the distance x between the incenter and the circumcenter are related by Fuss ...

  8. How adorable pooches are helping NYC students boost their ...

    www.aol.com/adorable-pooches-helping-nyc...

    The Comfort Dog Program can also be adapted to help with math and literacy skills. Instead of questions to prompt an emotional response, math and reading questions can be taped to the dice ...

  9. Quartic plane curve - Wikipedia

    en.wikipedia.org/wiki/Quartic_plane_curve

    Illustration of the inverse Pythagorean and regular Pythagorean theorems. The inverse Pythagorean theorem is obtained from the above equation by substituting x with AC, y with BC, and each a and b with CD, where A, B are the endpoints of the hypotenuse of a right triangle ABC, and D is the foot of a perpendicular dropped from C, the vertex of ...