63 terms

6th Math, 3rd Nine Weeks

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