ALERT 
Be aware that definitions
may vary slightly between textbooks. It depends upon how the
authors are going to use the definitions in their books.

For example: We have seen
the definition of isosceles triangle written in two different texts like
this:
 An isosceles triangle is
a triangle with at least two sides
the same length.
 An isosceles triangle is
a triangle with exactly two sides
the same length.
*Definition one says
that an equilateral triangle would also be classified as isosceles because
it has three equal sides, and thus the "at least two" requirement
would be satisfied.
**Definition two says that an equilateral
triangle would NOT be isosceles because it does not have EXACTLY three
sides.
SO WHICH ONE IS CORRECT? ......
Always choose the definition that is given by the authors of your class
textbook. They will have written their material based upon how they
have defined these terms.
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In themathlab.com
dictionary we make every attempt to present understandable definitions.
To help with clarity
we use many illustrations and common language wherever possible. Please
remember to cross reference any essential terms with your current textbook
to see if it has a more specific definition.
