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Math Dictionary
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Found 13 Terms

The size of an angle at the center of a circle formed by two radii and an arc that is the length of the radius

A line joining the center of a circle to a point on the circle's circumference.

range
In statistics, the difference between the greatest and least values in a set of data

ratio
A ratio is a comparison of two similar quantities obtained by dividing one quantity by the other. Ratios are written with the : symbol.

rational number
Numbers that can be written as a/b, where a and b are integers and b is not equal to 0. Real numbers that can be expressed as terminating or repeating decimals

rectangle
A quadrilateral with opposite sides equal and parallel and containing four right angles (a square is a rectangle).

reflex angle
An angle greater than 180º.

region
The interior area enclosed by a perimeter (the area outside the perimeter is the exterior region).

regular shape
A polygon is regular if all its sides and angles are congruent (opposite - irregular).

rhombus
A parallelogram with congruent sides and containing no right angles (a "diamond" shape).

right angle
An angle containing 90º.

right-angled triangle
A triangle containing one right angle (90º).

rotating
Turning in a clockwise or counter-clockwise direction.