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Chapter 1-64


angle Two rays with the same endpoint
polygon A flat (two-dimensional) geometric figure that has the following characteristics: • It is made of straight line segments. • Each segment touches exactly two other segments, one at each of its endpoints.
regular polygon A polygon with sides that are all the same length and angles that are all the same size.
concave polygon A polygon that looks like it is “collapsed” or has a “dent” on one or more sides. Any polygon with an angle measuring more than 180°.
sequence An ordered list. For example: 2, 5, 8, 11,… is a sequence.
line symmetry A polygon has line symmetry (or reflection symmetry)if you can fold it in half along a line so that the two halves match exactly.
term An item in a sequence. For example, 8 is a term in the sequence 2, 5, 8, 11,….
order of operations Parenthesis, Exponents, Multiplication/Division (whichever comes first), Addition/Subtraction (whichever comes first).
triangle inequality The triangle inequality states that the sum of the lengths of any two sides of a triangle is greater than the length of the third side. For example, the triangle inequality tells you that is impossible to have a triangle with sides of
vertex (plural: vertices) A corner of a polygon, where two sides meet. Vertices are usually labeled with capital letters, such as A, B and C for the vertices of a triangle.
symmetry An object is symmetrical when one half is a mirror image of the other half.
ambiguous A rule is ambiguous if it can be interpreted in two or more ways. When a rule is written, it must be unambiguous.
integers Integers are whole numbers (positive) and their opposites (negative).
perimeter The perimeter of a figure, or shape, is the length of the distance around the outside of the shape.
convention A convention is a rule people have agreed to follow because it is helpful or convenient for everyone to do the same thing.
endpoint A point marking the end of a line segment.
line segment A line segment has a beginning and an end(called endpoints).
line A line is straight and extends forever in two directions
ray A ray starts at an endpoint and extends forever in one direction.
prefixes tri: 3, quad: 4, penta: 5, hexa: 6, hepta: 7, octa: 8,nona: 9, deca: 10
congruent Objects having the same size and shape.
Created by: sullivan64