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### 23 Cards in this Set

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• Back
 acute angle An angle that is less than a right angle. An acute angle measures less than 90 degrees. axis A reference line in a coordinate system. The x and y axes are marked in this coordinate system. centimeter (cm) A metric unit of length equal to one hundredth of one meter. (100cm = 1m) foot A unit of length in the customary system of measurement. (1 foot = 12 inches) gallon A unit of capacity in the customary system of measurement. (1 gallon = 4 quarts) graph A pictorial representation of some mathematical relationship or set of data. hexagon A polygon with six sides. horizontal axis The number line from left to right in a rectangular coordinate system. Also called the x-axis. meter (m) The basic unit of length in the metric system. One meter is a little more than 39 inches. obtuse angle An angle whose measure is greater than 90 degrees but less than 180 degrees. octagon A polygon with eight sides. parallelogram A quadrilateral with opposite sides parallel and equal in length. Opposite angles are equal. polygon A closed straight sided two-dimensional figure. pound (lb) A unit of weight in the customary system of measurement. (1 pound = 16 ounces. right angle An angle that is one-fourth of a full rotation. A right angle measures 90 degrees. solid shape In geometry, a closed three-dimensional figure. square A rectangle with all four sides an equal length. symmetry When one side of a shape is a mirror image of the other side, the shape is said to have line symmetry. rotational symmetry When a shape can be turned through a fraction of a full rotation and stil look the same. tessellation A repeated plane shape used to cover a surface without overlapping or leaving any gaps. triangle A polygon with three sides. vertical axis The number line from top to bottom in a rectangular coordinate system. Also called the y-axis. yard (yd) A unit of length in the customary system of measurement. (1 yard = 3 feet or 36 inches)