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### 49 Cards in this Set

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 The distance around a closed figure. perimeter Of two rays that form an angle, the one that stays fixed in place while the terminal ray swings out from it. initial ray A 2-dimensional figure that does not start and end at the same point. open figure All the points between the rays of an angle. interior (of an angle) A triangle with two congruent sides. isosceles triangle The point that is an equal distance from every point on a circle. center A unit for measuring area. square unit An angle that has a measure of less than 90 degrees. acute angle An angle that has a measure of exactly 180 degrees. straight angle A 2-dimensional figure that starts and ends at the same point. closed figure A closed 2-dimensional figure with sides that are line segments. The sides do not cross each other. polygon A closed, curved 2-dimensional figure having all points an equal distance from the center. circle An exact location in space. point The distance around a circle. It is about 3 times the length of the diameter. circumference A part of a line that has one endpoint and continues in one direction without end. ray A number expressed using a decimal point. decimal A line segment that connects a point on a cirle with the center. radius An angle formed by two radii of a circle. central angle An angle that has a measure of exactly 90 degrees. right angle A point at the end of a ray or a line segment. endpoint Of two rays that form an angle, the one that opens out from the initial ray. terminal ray The number by which a dividend is divided. divisor An angle that has a measure greater than 90 degrees but less than 180 degrees. obtuse angle Another name for mean. average The number of cubic units that fit inside a 3-dimensional figure. volume The number that is to be raised to a given power. base A polygon whose sides and angles are not all of the same lengths and measures. irregular polygon A figure formed by two rays (sides) with the same endpoint (vertex). angle Lines that meet or cross at a common point. intersecting lines All points that are not on the ray or in the interior of an angle. exterior (of an angle) The ratio of the circumference of a circle to its diameter (about 3.14 or 22/7). pi A rule that is used to tell whether one number is divisible by another. divisibility rule A polygon with five sides and five angles. pentagon An operation on two numbers that tells how many groups or how many in each group. It can also tell how many are left over. division An operation that tells how many in all when equal groups are combined. multiplication The number of square units needed to cover a region or figure. area The common point of the two rays of an angle, two sides of a polygon, or three or more edges of a 3-dimensional figure. vertex One number is divisible by another if the remainder is 0 after dividing. divisible by An instrument used to draw or measure angles. protractor A unit used to measure angles. degree A part of a line between two endpoints. line segment A chord that passes through the center of a circle. diameter In division, the number left after the quotient is found. remainder A line segment that connects two points on a circle. chord Lines in the same plane that never intersect. parallel lines The result of division. quotient A straight path that goes in two directions without end. line Any lines in space that do not intersect and are not parallel. skew lines These are lines that cross each other at right angles. perpendicular lines