6th Math, 3rd Nine Weeks
algebra
a mathematical language that uses symbols, usually letters that stand for unknowns, along with numbers
equation
a mathematical sentence that states the two sides, separated by an equal sign, are equal
expression
a mathmatical statement that does not contain an equal to symbol
square
a parallelogram having four congruent sides and four right angles
rhombus
a parallelogram with all sides congruent
ray
a path that extends infinitely in one direction from one endpoint
octagon
a polygon with eight sides
quadrilateral
a polygon with four sides
hexagon
a polygon with six sides
triangle
a polygon with three sides and three angles
trapezoid
a quadrilateral with one pair of parallel sides
parallelogram
a quadrilateral with opposite sides congruent and opposite sides parallel
rectangle
a quadrilateral with opposite sides parallel, opposite sides congruent, and four right angles
side
a ray that is part of an angle or a line segment that is part of a polygon
pyramid
a solid figure that has a polygon for a base and triangles for faces
rectangular prism
a solid figure that has two parallel and congruent bases in the shape of polygons and at least three lateral faces shaped like rectangles
cone
a solid figure with a circular base, a curved face, and one vertex
cylinder
a solid figure with all curved surfaces, two circular bases, and no vertices
cube
a square prism is also known as a cube
variable
a symbol, usually a letter, used to represent an unknown value in expressions or equations
solid figure
a three dimensional figure
protractor
a tool for measuring and constructing angles
straightedge
a tool used for drawing straight lines
equilateral triangle
a triangle in which all three sides are congruent
scalene triangle
a triangle in which all three sides are different
isosceles triangle
a triangle with two congruent sides
plane figure
a two dimensional figure
acute angle
an angle with a measurement greater than 0 degrees and less than 90 degrees
right angle
an angle with a measurement of exactly 90 degrees
obtuse angle
an angle with the measurement greater than 90 degrees and less than 180 degrees
approximation
an inexact result adequate for a given purpose
pentagon
any polygon with five sides
data
information, often numerical, which is gathered for statistical purposes
noncongruent
not having the same size and same shape
measures of central tendency
numbers that are used to describe the center of a set of data; included are mean, median, and mode
congruent
same size and same shape
range
the difference between the greatest number and the least number in a set of data
diameter
the distance across a circle through the center
circumference
the distance around the outside of a circle
radius
the distance from the center of the circle to any point on the circle
face
the flat side of a solid figure
edge
the intersection of faces on a solid figure
perimeter
the measure of the distance around a polygon
length
the measurement of the extent of an object or shape along its greatest dimension
width
the measurement of the extent of an object or shape along its shortest dimension
median
the middle number in a set of data when the data are arranged in numerical order
coefficient
the number before a variable; for example, in the term 3x, then number 3 is the coefficient
area
the number of square units needed to cover the surface of a two dimensional figure
mode
the number(s) or item(s) that appear most often in a set of data
term
the part or parts of an expression or equation separated by operation symbols or the equal to symbol
corresponding
the parts of congruent figures that match
vertex
the point where the edges of a three dimensional figure intersect
pi
the ratio of the circumference of a circle to the diameter of a circle; equal to the fraction 22/7; often written as the approximation 3.14
height
the shortest distance from the base of a parallelogram to its opposite side; in a triangle, the distance from the base to the opposite vertex
mean
the sum of the numbers in a set of data divided by the number of pieces of data
base
the top and bottom faces of a three dimensional object
perpendicular
two line segments that meet at right angles
parallel
two or more lines, found in the same plane, that remain the same distance apart
angle
two rays with a common endpoint
polygon
a closed, two dimensional figure formed by three or more straight sides
ratio
a comparison of two numbers by division
three dimensional figure
a figure that encloses a part of space
diagonal
a line or plane joining two nonadjacent vertices of a polygon
