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2. Quadrilateral - Wikipedia

   en.wikipedia.org/wiki/Quadrilateral

   A quadric quadrilateral is a convex quadrilateral whose four vertices all lie on the perimeter of a square. [7] A diametric quadrilateral is a cyclic quadrilateral having one of its sides as a diameter of the circumcircle. [8] A Hjelmslev quadrilateral is a quadrilateral with two right angles at opposite vertices. [9]

3. Rectangle - Wikipedia

   en.wikipedia.org/wiki/Rectangle

   In Euclidean plane geometry, a rectangle is a rectilinear convex polygon or a quadrilateral with four right angles.It can also be defined as: an equiangular quadrilateral, since equiangular means that all of its angles are equal (360°/4 = 90°); or a parallelogram containing a right angle.

4. Ptolemy's theorem - Wikipedia

   en.wikipedia.org/wiki/Ptolemy's_theorem

   This is not a cyclic quadrilateral. The equality never holds here, and is unequal in the direction indicated by Ptolemy's inequality. The equation in Ptolemy's theorem is never true with non-cyclic quadrilaterals. Ptolemy's inequality is an extension of this fact, and it is a more general form of Ptolemy's theorem.

5. Kite (geometry) - Wikipedia

   en.wikipedia.org/wiki/Kite_(geometry)

   A quadrilateral is a kite if and only if any one of the following conditions is true: The four sides can be split into two pairs of adjacent equal-length sides. [7] One diagonal crosses the midpoint of the other diagonal at a right angle, forming its perpendicular bisector. [9] (In the concave case, the line through one of the diagonals bisects ...

6. The #1 Thing You Should Do Before a Big Meal to Prevent ...

   www.aol.com/1-thing-big-meal-prevent-120000828.html

   Additionally, studies show that fiber is highly satiating, helping you feel full for longer and eat less later throughout the day. Balls recommends incorporating fiber-rich foods into every meal ...

7. Varignon's theorem - Wikipedia

   en.wikipedia.org/wiki/Varignon's_theorem

   An arbitrary quadrilateral and its diagonals. Bases of similar triangles are parallel to the blue diagonal. Ditto for the red diagonal. The base pairs form a parallelogram with half the area of the quadrilateral, A q, as the sum of the areas of the four large triangles, A l is 2 A q (each of the two pairs reconstructs the quadrilateral) while that of the small triangles, A s is a quarter of A ...