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in reference to a triangle, the perpendicular distance from either the base of the triangle or an extension of the base to the opposite vertex; any side can be the base
the figure formed by two rays that have a common endpoint; the rotation of a ray about its endpoint from an initial position to a final position
for any real numbers a, b, and c, (a + b) + c = a + ( b + c) and
(a • b) • c = a • (b • c)
the sum of a set of numbers divided by the number of numbers in the set; also called the mean
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