joint variation: y varies jointly as x and z if y = kxz.

latus rectum: the chord through the focus of a parabola parallel to the directrix. The

chord through a focus of an ellipse perpendicular to the major axis.

law of cosines: c² = a² + b² - 2abCosC

law of sines: a/sin A = b/sin B = c/sin C

least common denominator: the least common denominator of two fractions, a/b and c/d,

is the smallest number that contains both b and d as factors.

least common multiple: the least common multiple of two numbers, a and b, is the

smallest number that contains both a and b as factors.

lemma: a theorem that is proved mainly as an aid in proving another theorem.

like terms: two terms each of whose parts, with the exception of their coefficients, is the

same.

line: a straight set of points that extends off into infinity in both directions.

line segment: two points on a line, and all the points between those two points.

logarithm: if y = b^x, then log_b y = x.

logic: the study of sound reasoning.

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