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geometry
lines rays angles
34
Mathematics
8th Grade
02/15/2011

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Term
location in space with no size
Definition
point
Term
a set of points extending infinately in two directions
Definition
line
Term
a flat surface with no thickness containing many lines and extending without end in the directions of its lines
Definition
plane
Term
part of a line with two endpoints
Definition
segment
Term
a set of points extending infinately in 1 direction
Definition
ray
Term
lines in the same plane that never intersect
Definition
parallel
Term
lines in different planes that never intersect
Definition
skewed
Term
a closed plane figure  made of three or more line segments
Definition
polygon
Term
a polygon with congruent sides
Definition
regular polygon
Term
3 sides
Definition
triangle
Term
4 sides
Definition
quadrilateral
Term
a rectangle with 4 congruent sides
Definition
square
Term
a parallelogram with 4 right angles
Definition
rectangle
Term
a parallelogram with 4 congruent sides
Definition
rhombus
Term
a quadrilateral with 2 pair of opposite sides parallel
Definition
parallelogram
Term
a quadrilateral with 1 pair of opposite sides parallel
Definition
trapezoid
Term
5 sides
Definition
pentagon
Term
6 sides
Definition
hexagon
Term
7 sides
Definition
heptagon
Term
8 sides
Definition
octagon
Term
9 sides
Definition
nonagon
Term
10 sides
Definition
decagon
Term
a triangle with an angle less than 90 degrees
Definition
acute
Term
a triangle with 1 angle that is 90 degrees
Definition
right triangle
Term
a triangle with 1 angle tha is more than 90 degrees
Definition
obtuse
Term
a triangle with three congruent sides
Definition
equilateral
Term
a triangle with at least 2 congruent sides
Definition
iscosceles
Term
a triangle with no congruent sides
Definition
scalene
Term
a quadrilateral with no pairs of parallel sides
Definition
trapezium
Term
a convex trapezium that has 2 congruent pairs of adjacent sides
Definition
kite
Term
a concave trapezium that has 2 congruent pairs of adjacent sides
Definition
deltoid
Term
what can a trapezoid be divided into
Definition
isosceles
Term
a trapezoid with 2 congruent legs
Definition
isosceles trapezoid
Term
a triangle with 3 congruent angles
Definition
equiangular triangle
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