quadrilateral condition - ορισμός. Τι είναι το quadrilateral condition
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Τι (ποιος) είναι quadrilateral condition - ορισμός

QUADRILATERAL WHOSE SIDES ARE ALL TANGENT TO A SINGLE CIRCLE INTERIOR TO IT
Inscriptable quadrilateral; Circumscribed quadrilateral; Co-cyclic quadrilateral
  • A bicentric quadrilateral ''ABCD'': the contact quadrilateral (pink) is orthodiagonal.
  • Construction of the Newton line (in red) of a tangential quadrilateral (in blue), showing the alignment of the incenter ''I'', the midpoints of the diagonals ''M''<sub>1</sub> and ''M''<sub>2</sub> and the middle ''M''<sub>3</sub> of the segment ''JK'' (in green) joining the intersection of opposing sides.
  • A tagential quadrilateral (in blue) and its ''contact quadrilateral'' (in green) joining the four contact points between the incircle and the sides. Also shown are the tangency chords joining opposite contact points (in red) and the tangent lengths on the sides
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  • Tangential quadrilateral with inradius ''r''
  • left
  • A tangential quadrilateral is partitioned in four triangles meeting at its incenter ''I'', their orthocenters (purple) and the intersection of the diagonals ''P'' (in green) are all colinear,.
  • A tangential quadrilateral with its incircle

Saccheri quadrilateral         
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QUADRILATERAL WITH TWO EQUAL SIDES PERPENDICULAR TO THE BASE
Khayyam-Saccheri quadrilateral; Saccheri Quadrilateral; Khayyam–Saccheri quadrilateral; Khayyam quadrilateral
A Saccheri quadrilateral (also known as a Khayyam–Saccheri quadrilateral) is a quadrilateral with two equal sides perpendicular to the base. It is named after Giovanni Gerolamo Saccheri, who used it extensively in his book Euclides ab omni naevo vindicatus (literally Euclid Freed of Every Flaw) first published in 1733, an attempt to prove the parallel postulate using the method Reductio ad absurdum.
Ex-tangential quadrilateral         
  • ABCD}}}}
CONVEX QUADRILATERAL WHERE THE EXTENSIONS OF ALL FOUR SIDES ARE TANGENT TO A CIRCLE OUTSIDE IT
Extangential quadrilateral
In Euclidean geometry, an ex-tangential quadrilateral is a convex quadrilateral where the extensions of all four sides are tangent to a circle outside the quadrilateral.Radic, Mirko; Kaliman, Zoran and Kadum, Vladimir, "A condition that a tangential quadrilateral is also a chordal one", Mathematical Communications, 12 (2007) pp.
Condition number         
FUNCTION K OF THE INPUT X OF A WELL-POSED PROBLEM WHICH DESCRIBES HOW MUCH ITS VARIATION INFLUENCES THE VARIATION OF THE OUTPUT G(X)
Ill-conditioned; Condition numbers; Ill-conditioned matrix; Matrix condition number; Ill-conditioning; Conditioning number; Well-conditioned
In numerical analysis, the condition number of a function measures how much the output value of the function can change for a small change in the input argument. This is used to measure how sensitive a function is to changes or errors in the input, and how much error in the output results from an error in the input.

Βικιπαίδεια

Tangential quadrilateral

In Euclidean geometry, a tangential quadrilateral (sometimes just tangent quadrilateral) or circumscribed quadrilateral is a convex quadrilateral whose sides all can be tangent to a single circle within the quadrilateral. This circle is called the incircle of the quadrilateral or its inscribed circle, its center is the incenter and its radius is called the inradius. Since these quadrilaterals can be drawn surrounding or circumscribing their incircles, they have also been called circumscribable quadrilaterals, circumscribing quadrilaterals, and circumscriptible quadrilaterals. Tangential quadrilaterals are a special case of tangential polygons.

Other less frequently used names for this class of quadrilaterals are inscriptable quadrilateral, inscriptible quadrilateral, inscribable quadrilateral, circumcyclic quadrilateral, and co-cyclic quadrilateral. Due to the risk of confusion with a quadrilateral that has a circumcircle, which is called a cyclic quadrilateral or inscribed quadrilateral, it is preferable not to use any of the last five names.

All triangles can have an incircle, but not all quadrilaterals do. An example of a quadrilateral that cannot be tangential is a non-square rectangle. The section characterizations below states what necessary and sufficient conditions a quadrilateral must satisfy to be able to have an incircle.