An angle whose measure is between 0° and 90°

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One of two or more numbers that are added to find a sum.

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Two angles that have a common side and a common vertex. The angles lie on opposite sides of their common side.

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The opening that is formed when two lines, rays, or segments intersect.

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The size of the inside of a flat shape...measured in square units.

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The grouping of addends does not affect their sum. In symbolic form,

a + (b + c) = (a + b) + c.

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The number found when the sum of two or more numbers is divided by the number of addends in the sum; also called mean.

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The point inside a circle or sphere from which all points on the circle or sphere are equally distant.

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An angle whose vertex is the center of a circle.

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A segment whose endpoints lie on a circle.

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A closed, curved shape in which all points on the shape are the same distance from its center.

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The perimeter of a circle.

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In common use, the number that multiplies the variable(s) in an algebraic term.

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Changing the order of addends does not change their sum. In symbolic form,

a + b = b + a.

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A tool used to draw circles and arcs.

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Two angles whose sum is 90°

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A counting number greater than 1 that is divisible by a number other than itself and 1.

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Two or more circles with a common center.

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Having the same size and shape.

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A grid on which any point can be identified by an ordered pair of numbers.

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Sides or angles of similar polygons that occupy the same relative positions.

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The bottom term of a fraction.

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The distance across a circle through its center.

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The result of subtraction.

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a x (b + c) = (a x b) + (a x c)

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A number that is divided

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A number by which another number is divided.

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A statement that uses the symbol "=" to show that two quantities are equal.

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A triangle in which all sides are the same length.

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To determine an approximate value.

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A way of writing a number as the sum of the products of the digits and the place values of the digits.

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The upper number in an exponential expression that shows how many times the base is to be used as a factor.

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(1) Noun: One of two or more numbers that are multiplied.

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The largest whole number that is a factor of two or more indicated numbers.

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An angle that opens to the interior of a circle and has its vertex on the circle.

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The set of counting numbers, their opposites, and zero; the members of the set {..., -2, -1, 0, 1, 2, ...).

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A triangle with at least two sides of equal length.

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The smallest whole number that is a multiple of two or more given numbers.

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A straight collection of points extending in opposite directions without end.

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The middle number of a list of data when the numbers are arranged in order from the least to the greatest.

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A number from which another number is subtracted.

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The number or numbers that appear most often in a list of data.

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The top term of a fraction.

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An angle whose measure is between 90° and 180°.

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The point (0, 0) on a coordinate plane.

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A number in a list of data that is distant from the other numbers in the list.

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The distance around a closed, flat shape.

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A counting number greater than 1 whose only two factors are the number 1 and itself.

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The result of multiplication.

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A tool that is used to measure and draw angles.

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The answer to a division question.

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The distance from the center of a circle or sphere to a point on the circle or sphere.

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The repeating digits of a decimal number. The symbol for a repetend is an overbar ( vinculum)

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Having the same shape but not necessarily the same size. Corresponding parts of ... are proportional.

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An angle that measures 180° and thus forms a straight line.

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A number that is subtracted.

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Two angles whose sum is 180°.

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A letter used to represent a number that has not been designated.

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A point of an angle, polygon, or polyhedron where two or more lines, rays, or segments meet.

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