DJ Geometry
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A 2D shape that is a flat side of a 3D shap
face

a line where two faces meet on a 3D shape
edge

a point on a shape, a corner where several faces and edges come together
vertex

identical in size and shape
congruent

a 3D shape with 2 congrunent bases and the other faces are 4 sided
prism

a 2D shape made up of straight lines and the lines are closed
polygon

two lines that are always the same distance apart and never touching
parallel lines

lines that cross
intersecting lines

a four sided shape with opposite sides that are parallel, e.g. rectangle
parallelogram

has one pair of opposite sides that are parallel  a trapezoid is not a parallelogram because only one pair of sides are parallel
trapezoid

any 2D shape which has four sides that are straight
quadrilateral

a parallelogram with 4 equal sides
rhombus

a shape that has height and length
2D shape

a shape that has height, length, and depth
a 3D shape

a point at which a line begins
ray

the sliding of a shape
translation

the turning of a shape
rotation

the flipping of a shape
reflection

less than 90 degress
acute angle

greater than 90 degrees
obtuse angle

a 90 degree angle
right angle

a line that divides a shape in half so that if you fold the shape in half the two sides match
line of symmetry

a flat shape that folds to create a 3D shape
net

What is the name of a 3 sided shape
triangle

That is the name of a 4 sided shape
rectangle

what is the name of a 5 sided shape
pentagon

what is the name of a 6 sided shape
hexagon

what is the name of a 7 sided shape
heptagon

what is the name of a 8 sided shape
octagon