geometry

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trapezoid
A quadrilateral with exactly one pair of parallel sides
Parallelogram
A quadrilateral with both pairs of opposite sides parallel
Rhombus
A quadrilateral with four congruent sides
Pentagon
A five sided polygon
Hexagon
A six sided polygon
Heptagon
A seven sided polygon
octagon
An eight sided polygon
Nonagon
A nine sided polygon
Decagon
A ten sided polygon.
congruent
An exact same size and shape
transformation
changing the position of a shape on the coordinate plane
translation
slide
reflection
flip
rotation
turn
Line of symmetry
The imaginary line where you could fold the image and have both halves match exactly
Polygon
2 dimensions
made of at least 3 line segments that do not cross
sides are not curved
REGULAR polygon
any polygon where all sides and all angles of the polygon are equal ( same exact measurement )
vertex
common point of two lines , line segments or rays
diagonal
A straight line inside a shape that goes from one corner to another ( but not An edge ) so if you join two vertices of a polygon which are not already joined by an edge , you get a diagonal.
triangle
a polygon with three angles and three sides
Quadrilateral
any polygon with four angles and four sides Includes specific polygons such as square , rectangles , parallelograms and trapezoids
Rectangle
A quadrilateral with four right sides
Square
A rectangle with four sides of equal length
vertical
going up and down like a column
The prime meridian and other lines of longitude are vertical
angle
two rays sharing the same endpoint
the endpoint is called the vertex
Right angle
an angle measuring 90 degrees
Acute angle
an angle smaller than a right angle
obtuse angle
an angle larger than a right angle
intersecting lines
have one point in common
perpendicular lines
special intersecting lines that form right angles where they intersect
Parallel lines
lie in the same place and do not intersect
are always the same distance apart
do not share any points
point
A location in space
has no length , width , or height
it is usually named with a capital letter
endpoint
A special kind of point at which a line segment or ray ends
A RAY has ONE endpoint
A segment has TWO endpoints
line
goes on forever in both directions
has no endpoints
line segment
part of a line
has two endpoints
ray
part of a line
has one endpoint and continues indefinitely in one direction
horizontal
going side to side like a row
the equator and other lines of latitude are horizontal
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