A chord is a line segment whose endpoints lie on a circle. A secant is a line (or line segment) that intersects a circle in two places, endpoints NOT on the circle.
A non-numeral is any word or symbol that represents a numeral, but is not a numeral. Therefore, an example of a non-numeral less than ten is three.
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Formula
Ordered data.
It is a square or a rectangle where each interior angle is a right angle of 90 degrees.