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Overview

perpendicular bisector

The perpendicular bisector of a line segment AB is the straight line perpendicular to AB through the midpoint of AB.

perpendicular bisector

The perpendicular bisector of a line segment AB is the straight line perpendicular to AB through the midpoint of AB.

bisector

The line that divides an angle into two equal angles. See also internal bisector, external bisector and perpendicular bisector.

circumcentre

The circumcentre of a triangle is the centre of the circumcircle of the triangle. It is the point O, shown in the figure, at which the perpendicular bisectors of the sides of the triangle are ...

kite

A quadrilateral that has two adjacent sides of equal length and the other two sides of equal length. If the kite ABCD has AB=AD and CB=CD, the diagonals AC and BD are perpendicular, and AC bisects BD.

Brillouin zone

A cell in a reciprocal lattice. The first Brillouin zone is the cell of smallest volume enclosed by those planes that are perpendicular bisectors of reciprocal lattice vectors. Higher Brillouin zones ...

equidistant

Being the same distance from one or more points or objects. The perpendicular bisector of the line segment AB is the set of points equidistant from A and B.The set of points equidistant from a fixed ...

axis of symmetry

A line in which the mirror image of a curve or geometrical figure maps onto itself. The condition for this is that for each point P on the curve or figure the point P′ is also, where the axis is the ...

skeletagenous septum

One of a series of segments which develop along the notochord and are separated by myosepta. Septa occur in two planes. Dorsal and ventral septa are plate-like processes which grow dorsally and ...

Wigner-Seitz cell

A polyhedron in a crystal that is bounded by planes formed by perpendicular bisectors of bonds between lattice sites. The Wigner-Seitz cell was used by Hungarian-born US physicist Eugene Wigner ...

pedal triangle

In the triangle with vertices A, B, and C, let D, E and F be the feet of the perpendiculars from A, B and C, respectively, to the opposite sides, so that AD, BE and CF are the altitudes. The triangle ...

Schoenflies system

A system for categorizing symmetries of molecules. Cn groups contain only an n-fold rotation axis. Cnv groups, in addition to the n-fold rotation axis, have a mirror plane that contains the axis of ...

locus

A locus (in the plane) is the set of all points in the plane that satisfy some given condition or property. For example, the locus of all points that are a given distance from a fixed point is a ...

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