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2. Rhombus - Wikipedia

   en.wikipedia.org/wiki/Rhombus

   Every rhombus is a kite, and any quadrilateral that is both a kite and parallelogram is a rhombus. A rhombus is a tangential quadrilateral. [10] That is, it has an inscribed circle that is tangent to all four sides. A rhombus. Each angle marked with a black dot is a right angle.

3. Orthodiagonal quadrilateral - Wikipedia

   en.wikipedia.org/wiki/Orthodiagonal_quadrilateral

   The kites are exactly the orthodiagonal quadrilaterals that contain a circle tangent to all four of their sides; that is, the kites are the tangential orthodiagonal quadrilaterals. [1] A rhombus is an orthodiagonal quadrilateral with two pairs of parallel sides (that is, an orthodiagonal quadrilateral that is also a parallelogram).

4. List of trigonometric identities - Wikipedia

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

   A formula for computing the trigonometric identities for the one-third angle exists, but it requires finding the zeroes of the cubic equation 4x 3 − 3x + d = 0, where is the value of the cosine function at the one-third angle and d is the known value of the cosine function at the full angle.

5. Trigonometry - Wikipedia

   en.wikipedia.org/wiki/Trigonometry

   Fig. 1a – Sine and cosine of an angle θ defined using the unit circle Indication of the sign and amount of key angles according to rotation direction Trigonometric ratios can also be represented using the unit circle , which is the circle of radius 1 centered at the origin in the plane. [ 37 ]

6. Circle - Wikipedia

   en.wikipedia.org/wiki/Circle

   Since the interior and exterior angles sum to 180 degrees, the angle CPD is exactly 90 degrees; that is, a right angle. The set of points P such that angle CPD is a right angle forms a circle, of which CD is a diameter. Second, see [18]: 15 for a proof that every point on the indicated circle satisfies the given ratio.

7. Cowboys owner Jerry Jones lobbies for NFL Christmas Day games ...

   www.aol.com/cowboys-owner-jerry-jones-lobbies...

   All four of those teams played their Week 16 games on Saturday to accommodate for competing on a Wednesday. Music superstar and Houston native Beyoncé is expected to perform at halftime of the ...