GEOMETRY GLOSSARY

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Title Description
N-gon When a polynomial has so many sides that we cannot easily remember its name, we just take the number of sides (n) and add "gon" to our characterization, as a 16-sided polygon would be called a "16-gon." Play_video
Natural Numbers The set of Natural Numbers is also the set of counting numbers, the same numbers we learn to count when we're little kids: 1, 2, 3, 4....
More precisely in the language of math these are the positive integers.
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Negative Real values less than zero are Negative.
We also consider the Negative of a real value to have the opposite sign, as the opposite (or Negative) of a Negative value is positive.
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Negative Reciprocal The product of two Negative Reciprocals is -1.
When lines in Cartesian or rectangular coordinates meet at right angles they have Negative Reciprocal slopes, unless they are precisely horizontal and vertical.
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Non-collinear Not linear, not aligned, not part of the same line.
Not collinear.
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Non-Euclidean A geometry in which the Parallel Postulate does not hold may be termed a Non-Euclidean geometry.
In such a geometry, the shortest distance between two points may not be a straight line.
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Nonagon A nine-sided polygon.
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Nonnegative We have occasions to refer to all positive values as well as to zero.
These are all the real values that are Nonnegative.
Literally, not negative.
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Nth Root Given some integer N and a real value, the Nth Root of the real value is the number that when raised to the N power returns the real value.
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Null Set The Null Set is the empty set.
Mathematically there is but one empty set, the unique Null Set, the set with nothing in it.
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Number Line The real Number Line is a depiction of the set of all real numbers from negative infinity to positive infinity.
All real numbers lie on the Real Number Line.
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