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 e The number used as the base for natural logarithms. Equal to "2.7182818..." Ellipse a curved line with the sum of the distances from imaginary points (foci) to each point on the curve is constant Equation An algebraic expression asserting the equality of two quantities. Example: x + 4 = y -10 Equilateral A figure with all it's sides equal in length. Example: A square is equilateral Equilateral Triangle A triangle with all sides and angles equal in length. Estimate An approximate calculation of the value of something. Exponent a small figure placed to the upper-right of a number showing the number of times to multiply that number by itself Expression A mathematical symbol, or combination of sybols, representing a value, or relation. Example: 2+2=4  