# Search Results for ""

1 - 10 of 3209 for Points, lines, rays, segments, and vecto...Search Results

Two

**points**z**and**z^S in C^* are symmetric with respect to a circle or straight**line**L if all circles**and**straight**lines**passing through z**and**z^S are orthogonal to L. Möbius ...Two

**points**are antipodal (i.e., each is the antipode of the other) if they are diametrically opposite. Examples include endpoints of a**line****segment**, or poles of a sphere. ...Two or more

**lines**or**line****segments**which are perpendicular are said to be orthogonal.If any set of

**points**is displaced by X^idx_i where all distance relationships are unchanged (i.e., there is an isometry), then the**vector**field is called a Killing**vector**. ...The 60 Pascal

**lines**of a hexagon inscribed in a conic intersect three at a time through 20 Steiner**points**,**and**also three at a time in 60 Kirkman**points**. Each Steiner**point**...In a given triangle DeltaABC with all angles less than 120 degrees (2pi/3, the first Fermat

**point**X or F_1 (sometimes simply called "the Fermat**point**," Torricelli**point**, or ...The Euler

**points**are the midpoints E_A, E_B, E_C of the**segments**which join the vertices A, B,**and**C of a triangle DeltaABC**and**the orthocenter H. They are three of the nine ...The

**lines**of a pencil joining the**points**of a**line****segment**range to another**point**.**Lines**that intersect in a

**point**are called intersecting

**lines**.

**Lines**that do not intersect are called parallel

**lines**in the plane,

**and**either parallel or skew

**lines**in ...

The first Brocard

**point**is the interior**point**Omega (also denoted tau_1 or Z_1) of a triangle DeltaABC with**points**labeled in counterclockwise order for which the angles ......