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VOCAB
vocab for geometry
84
Mathematics
9th Grade
05/27/2009

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Cards

Term
transitive/substitution
Definition
if a=b and b=c, then a=c
Term
dilation
Definition
an enlarged figure of the orginal shape
Term
arc
Definition
part of a circle form 1 point to another
Term
congruent
Definition
2 figures with the shape and size
Term
reflexive (property)
Definition
stating that a segment or an angle is = to itself
Term
complimentary
Definition
2 angles that add up to 90 degrees
Term
secant
Definition
a line that contains a chord
Term
skew (lines)
Definition
2 lines that are noncoplanor
Term
transversal
Definition
a line that intersects 2 parallel lines
Term
proportion
Definition
a statement which states that ratios are congruent
Term
regular polygon
Definition
a shape with all congruent sides and angles
Term
area
Definition
# of square units within a boundary of a closed region
Term
decagon
Definition
10-sided figure
Term
midpoint
Definition

a point deviding the center of a segment in 2

or

a point on a segment where the segment is bisected

Term
conditional statement
Definition
an if-then statement
Term
foot
Definition
point of intersection of a plane and a line
Term
counter example
Definition
an example showing something not true
Term
extremes
Definition
the 1st and last term in a proportion
Term
polygon
Definition
a plane closed figure whose sides are non intersecting except for the vertices
Term
rectangle
Definition
a shape with 4 right angles
Term
semi-circle
Definition
half a circle
Term
radius
Definition

half the diameter of a circle

 

Term
pentagon
Definition
a polygon with 5 sides
Term
tangent
Definition
a line that intersects a circle at exactly 1 point
Term
converse
Definition
"if" and "then" in a statement are interchanged
Term
square
Definition
a polygon that is a rhombus and a rectangle
Term
similar figures
Definition
2 figures with the same shape but not the same size
Term
concentric
Definition
circles with the same point as their center
Term
slope
Definition

the m in y=mx + b

the slant of a line

Term
colinear
Definition
points on the same line
Term
circle
Definition
a set of all points in a plane that are the same distance from a given point 
Term
cone
Definition
a pyramid with a circular base
Term
auxiliary line
Definition
an additional line drawn in a proof or problem
Term
diagonal
Definition
a line that joins 2 non-consecutative vertices
Term
hexagon
Definition
6 sided figure
Term
incenter
Definition
the center of a polygon's inscribed circle
Term
sphere
Definition
a figure made up of points that are the same distance from a given point
Term
prism
Definition
a polyhedron with 2 congruent parallel bases and all parallel lateral edges
Term
trapezoid
Definition
a quadilateral with 1 pair of parallel sides
Term
prependicular
Definition
2 lines that intersect to form a right angle
Term
vertex
Definition
the point where 2 rays meet to form an angle
Term
lateral faces
Definition
the faces of a prism that are not the base
Term
isosceles triangle
Definition
a triangle with 2 congruent sides and 2 congruent base angles
Term
septagon (heptagon)
Definition
7 sided figure
Term
right angle
Definition
an angle that measures 90 degrees
Term
acute angle
Definition
an angle that measures less than 90 degrees
Term
inscribed angle
Definition
an angle whose vertex is on a circle and whose sides are determined by 2 chords
Term
apothem
Definition
a perpendicular segment form the center of a regular polygon to it's side
Term
diameter
Definition
the chord that passes through the center of the circle
Term
ray
Definition
a line with 1 endpoint
Term
equilateral triangle
Definition
a triangle with 3 congruent sides and angles
Term
median
Definition
a segment drawn from a vertex in a triangle to the opposite midpoint
Term
altitude/height
Definition
a perpendicular segment from the vertex of a triangle to the opposite midpoint
Term
faces
Definition
the polygons that form a polyhedron
Term
slant height
Definition
the height of 1 of the lateral faces in a right pyramid
Term
polyhedron
Definition
a 3 dimenstional figure whose faces are all polygons
Term
pythagorean theorem
Definition

a2 + b2 = c2

an equation used to find the lengths of the sides of a triangle

Term
dodecagon
Definition
12 sided figure
Term
chord
Definition
a segment joining 2 points on a circle
Term
plane
Definition
an infiniate flat surface
Term
corresponding angles
Definition
in a figure formed by 2 parallel lines and a transversal, a pair of angles on the same side of the transversal, one in the interior and one in the exterior of the figure, having different vertices
Term
contropositive
Definition
interchanging and negating "if" and "then"
Term
line of centers
Definition
a segment whose endpoints are the centers of 2 circles
Term
alternate interior angles
Definition
a pair of angles in the interior of a figure fromed by 2 parallel lines and a transversal, lying on alternate sides of the transversal and having different vertices
Term
rhombus
Definition
a figure with 4 congruent sides
Term
exterior angle
Definition
a side of polygon that is extended outside the figure
Term
line
Definition
an infinate straight path of points
Term
same side interior angle
Definition
2 angles in a figure formed by 2 parallel lines and 1 transversal where 1 is on the bottom and the other is on the top
Term
parallelogram
Definition
a quadrilateral where both pairs of opposite sides are parallel
Term
inverse
Definition
negativing the if then statement
Term
geometric mean
Definition
mean proportional
Term
ratio
Definition
a quotient with 2 numbers
Term
pyramid
Definition
a polyhedron with 1 base and triangular faces
Term
concentric
Definition
circles the same center points
Term
circumcenter
Definition
center of a polygon's circumscribed circle
Term
frustum
Definition
a figure formed by slicing a cone parallel to it's base and removing the top of the cone
Term
scalene triangle
Definition
a triangle where no sides are congruent
Term
circumference
Definition
the perimeter of a circle
Term
angle
Definition
the union of 2 rays with a common endpoint
Term
central angle
Definition
an angle whose vertex is at the center of the circle
Term
hypotenuse
Definition
the largest side of a right triangle
Term
parallel lines
Definition
2 coplanar lines that don't intersect
Term
postulate
Definition
a statement accepted without proof
Term
proportion
Definition
an equation where 2 ratio are stated as equal
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