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Glossary Term circumcenter circumference circumscribed polygon Closure Property cluster clustering coefficient coinciding lines collinear points combination common denominator Definition The point of concurrency of the perpendicular bisectors of a triangle. The distance around a circle. A polygon with each side tangent to a circle. A set of numbers is closed for addition or multiplication if the sum or product of two numbers is still included in the same number system. Data that are grouped closely together. An estimation method in which a group of numbers close in value are rounded to the same number. The numerical factor of a term. The graphs of two equations that represent the same line. Three or more points that lie on the same line. In the figure, P, Q, and L are collinear points. An arrangement or listing in which order is not important. A common multiple of the denominators of two or more fractions. Example: 24 is the common denominator of and common difference common factor common logarithm common multiples common ratio Commutative Property 1 5 , , 3 8 3 because 24 is the LCM of 3, 8, and 4. 4 The difference between any two consecutive terms in an arithmetic sequence. A whole number that is a factor of each number in a set of numbers. Example: 5 is a common factor of 10, 15, 25, and 100. A logarithm that uses 10 as the base. Multiples that are shared by two or more numbers. Example: Some common multiples of 2 and 3 are 6, 12, and 18. The quotient between any two consecutive terms in a geometric sequence. The order in which two numbers are added or multiplied does not change their sum or product. For any numbers a and b, a + b = b + a and ab = ba. Example: 2 + 3 = 3 + 2 or 2 • 3 = 3 • 2