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Course 2 Chapter 7
Chapter 7 Vocab
45
Mathematics
7th Grade
02/02/2011

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Term
point
Definition
a location that has no size
Term
line
Definition
a series of points that extends in two opposite directions without end
Term
ray
Definition
part of a line, with one endpoint and all the points of the side of the endpoint
Term
segment
Definition
this has two endpoints and all the points of the line between the point
Term
plane
Definition
a flat surface that extends indefinitely in all directions
Term
intersecting lines
Definition
lines that have exactly one point in common
Term
parallel lines
Definition
lines in the same plane that never intersect
Term
skew lines
Definition
lines that lie in different planes; they are neither parallel nor intersecting
Term
angle
Definition
formed by two rays with a common endpoint called a vertex
Term
vertex
Definition
the point of intersection of two sides of an angle or a figure
Term
acute angle
Definition
an angle with a measure between 0 and 90 degrees
Term
right angle
Definition
an angle with a measure of 90 degrees
Term
obtuse angle
Definition
an angle with a measure greater than 90 degrees and less than 180
Term
straight angle
Definition
an angle with a measure of 180
Term
complementary
Definition
Two angles are this if the sum of their measure is 90 degrees
Term
supplementary
Definition
two angles whose measures add to 180 degrees
Term
adjacent angles
Definition
angles that share a vertex and a side but have no interior points common
Term
vertical angles
Definition
angles that are formed by two intersecting lines
Term
congruent angles
Definition
angles that have the same measure
Term
scalene triangle
Definition
a triangle with no congruent sides
Term
isosceles triangle
Definition
a triangle with at least two congruent sides
Term
equilateral triangle
Definition
a triangle with three congruent sides
Term
right triangle
Definition
a triangle with one right angle
Term
acute triangle
Definition
a triangle with 3 acute angles
Term
obtuse triangle
Definition
a triangle with one obtuse angle
Term
polygon
Definition
a closed figure formed by three or more line segments that do not cross
Term
quadrilateral
Definition
a polygon with four sides
Term
pentagon
Definition
a polygon with five sides
Term
hexagon
Definition
a polygon with six sides
Term
octagon
Definition
a polygon with eight sides
Term
decagon
Definition
a polygon with 10 sides
Term
regular polygon
Definition
a polygon with all sides congruent and all angles congruent
Term
irregular polygon
Definition
a polygon with sides that are not all congruent and/or angles that are not all congruent
Term
trapezoid
Definition
a quadrilateral with exactly one pair of parallel sides
Term
parallelogram
Definition
a quadrilateral with both pairs of opposite sides parallel
Term
rectangle
Definition
a parallelogram with four right angles
Term
rhombus
Definition
a parallelogram with 4 congruent sides
Term
square
Definition
a parallelogram with 4 right angles and 4 congruent sides
Term
congruent polygons
Definition
polygons with the same size and shape
Term
circle
Definition
the set of points in a plane that are all the same distance from a given point called the center
Term
radius
Definition
a segment that connects the center of a circle to a circle
Term
diameter
Definition
a segment that passes through the center of a circle and has both endpoints on the circle
Term
central angle
Definition
an angle with its vertex at the center of a circle
Term
chord
Definition
a segment that has both endpoints on the circle
Term
circle graph
Definition
a graph of data where a circle represents the whole
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