Download Geometry

Geometry
Points, Lines, and
Shapes!
Plane

plane
A flat surface that
stretches into infinity.
Point

point
A location in a plane or
in space, having no
dimensions.
Line Segment

line segment
Two points on a line,
and all the points
between those two
points.
Line

line
A straight set of points
that extends into infinity
in both directions.
Ray

ray
part of a line, with one
endpoint, and
extending to infinity in
one direction.
Intersecting Lines

intersecting lines
Lines that have one
and only one point in
common.
Parallel Lines

parallel lines
Two lines are parallel if
they are in the same
plane and never
intersect.
Perpendicular Lines

perpendicular lines
Two lines are
perpendicular if the
angle between them is
90 degrees.
Angle

angle
The union of two rays
with a common
endpoint, called the
vertex.
Acute Angle

acute angle
A positive angle
measuring less than 90
degrees.
Right Angle

right angle
An angle whose
measure is 90 degrees.
Obtuse Angle

obtuse angle
An angle whose
measure is greater than
90 degrees.
Straight Angle

straight angle
An angle that measures
180 degrees.
Polygon

polygon
A closed plane figure made up of several line
segments that are joined together.
Triangle


triangle
A three-sided polygon.
Triangles can be
classified according to
the measures of their
angles and their sides.
Acute Triangle

acute triangle
A triangle each of
whose angles
measures less than 90
degrees.
Right Triangle

right triangle
A triangle that contains
a right angle.
Obtuse Triangle

obtuse triangle
A triangle with an
obtuse angle.
Scalene Triangle

scalene triangle
A triangle with no
congruent (exactly the
same size and shape)
sides.
Isosceles Triangle

isosceles triangle
A triangle with two
congruent (exactly the
same size and shape)
sides.
Equilateral Triangle

equilateral triangle
A triangle with all sides
that are congruent
(exactly the same size
and shape).
Circle

circle
The set of points in a
plane that are a fixed
distance from a given
point, called the center.
Circle

circle
The set of points in a
plane that are a fixed
distance from a given
point, called the center.
Quadrilateral

quadrilateral
Any four-sided figure is
called a quadrilateral.
Parallelogram

parallelogram
A quadrilateral with
opposite sides parallel.
Rectangle

rectangle
A parallelogram with
four 90-degree (right)
angles.
Square

square
A parallelogram with
four congruent (equal)
sides and four 90
degree (right) angles.
Rhombus


rhombus
A parallelogram with
four congruent (equal)
sides.
Opposite angles are
congruent.
Trapezoid




trapezoid
A quadrilateral that has
exactly one pair of parallel
sides.
The parallel sides are called
bases.
The non-parallel sides are
called legs.
If the legs have the same
length, then the trapezoid is
an isosceles trapezoid.
Isosceles
Trapezoid
Isosceles
Trapezoid
Kite


kite
A quadrilateral that is
shaped like a diamond.
Sometimes people like
to fly them! 
It has two distinct pairs
of adjacent (side-byside) congruent sides.
Cylinder

cylinder
a solid figure that has
two parallel bases that
are congruent circles
Cone

cone
a solid figure that has a
flat, circular base and
one vertex
Cube

cube
a solid figure with six
congruent square faces
Square Pyramid

Square Pyramid
a solid figure with a
square base and with
four triangular faces
that have a common
point
Rectangular Prism

Rectangular Prism
a solid figure in which
all six faces are
rectangles.
Rotation (turn)

Rotation (turn)
a movement of a figure
to a new position by
turning it around a
vertex
Reflection (flip)

Reflection (flip)
a movement of a figure
to a new position by
flipping it over a line
Translation (slide)

Translation (slide)
a movement of a figure
to a new position along
a straight line