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C

Concentric

Used to describe circles that have the same centre, e.g. in some castles two turrets are built around each other for double the protection; their cross sections will form concentric circles.

Cone

A 3D shape consisting of a circular base, a vertex (point) in a different plane, and line segments joining all the points on the circle circumference to the vertex.


Congruent (shapes)

Adjective describing two or more geometric figures that are the same in every way except their position in space. Example: Two figures, where one is a reflection of the other, are congruent since one can be transposed onto the other without changing any angle or edge length.

Noun: congruence.


Consecutive

Following in order. Consecutive numbers are adjacent in a count. Examples: 5, 6, 7 are consecutive numbers. 25,30,35 are consecutive multiples of 5. In a polygon, consecutive sides share a common vertex and consecutive angles share a common side.


Constant (noun)

A number or quantity that does not vary. Example: in the equation y = 3x + 6, the 3 and 6 are constants, whereas x and y are variables.


Continuous Data

Data arising from measurements taken on a continuous variable (examples: lengths of caterpillars; weight of crisp packets) that can take on an infinite or effectively infinite set of values. 

Compare with discrete data.

Convex

Adjective to describe a line or surface that describes outwards, like the shape of a circle. .

A convex polygon has all its interior angles less than or equal to 180 degrees


Corner

In elementary geometry, a point where two or more lines or line segments meet.

Also called a vertex, or vertices (plural). Example: a rectangle has 4 vertices; a cube has 8.

Correlation

A measure of the strength of the association between two variables. High correlation implies a close relationship and low correlation a less close one. If an increase in one variable results in an increase in the other, then the correlation is positive. Example: there should be a positive correlation between your understanding of maths and your enjoyment of it. If an increase in one variable results in a decrease in the other, then the correlation is negative. The term zero correlation does not necessarily imply no relationship, but merely no linear relationship.


Corresponding Angles

Where two straight-line segments are intersected by a third, as in the diagrams, the angles

Angles

a and e are corresponding. Similarly b and f, c and g and d and h are corresponding. Where parallel lines are cut by a straight line, corresponding angles are equal.


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