## perpendicular bisector

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

## perpendicular bisector Quick reference

### The Concise Oxford Dictionary of Mathematics (5 ed.)

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

## perpendicular bisector

## bisector

## circumcentre

## kite

## Brillouin zone

## equidistant

## axis of symmetry

## skeletagenous septum

## Wigner-Seitz cell

## pedal triangle

## Schoenflies system

## locus

## bisector Quick reference

### The Concise Oxford Dictionary of Mathematics (5 ed.)

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

## kite Quick reference

### The Concise Oxford Dictionary of Mathematics (5 ed.)

...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...

## circumcentre Quick reference

### The Concise Oxford Dictionary of Mathematics (5 ed.)

...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...

## axis of symmetry Quick reference

### The Concise Oxford Dictionary of Mathematics (5 ed.)

...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 perpendicular bisector of PP...

## pedal triangle Quick reference

### The Concise Oxford Dictionary of Mathematics (5 ed.)

...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 DEF is called the pedal triangle. The altitudes of the original triangle bisect the angles of the pedal...

## skeletagenous septum Quick reference

### A Dictionary of Zoology (4 ed.)

...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 ventrally to the notochord; horizontal septa bisect this plane perpendicularly. Mesenchymal cells migrate to the skeletagenous septa during the gastrula stage of embryogenesis to form sclerotomic tissue ( see somite ). At the junction between the myoseptum and skeletagenous septum vertebrae develop; they are consequently intersegmental...

## Thiessen polygon Quick reference

### A Dictionary of Geography (5 ed.)

...polygon A subdivision of a drainage basin, containing a rain gauge. Polygons are constructed by first siting the rain gauges, plotting them on a base map, and connecting the sites by straight lines. The lines are bisected with perpendiculars, which meet to form the polygons. The areas of the polygons are calculated and expressed as fractions of the total area. Each fraction is multiplied by the precipitation recorded by its rain gauge. The sum of these calculations represents total precipitation over the catchment area. For an account, see Yoo et al....