Since vocabulary is a huge part of geometry, I am attaching a list of the "Words to Know". The list is also in the composition book.
Geometry Words to Know
Point
|
An
exact location in space
|
Line
|
A
series of points that extend in both directions without end
|
Ray
|
A
series of points that extend in one direction and has one endpoint
|
Segment
|
A
part of a line with two endpoints
|
Plane
|
A
flat surface
|
Intersecting
lines
|
Lines
that have one point in common
|
Parallel
lines
|
Lines
in the same plane that never intersect
|
Perpendicular
lines
|
Lines
that intersect at a 90° angle
|
Skew
lines
|
Lines
that are on different planes so they can never intersect
|
Angle
|
Two
rays with a common endpoint
|
Vertex
|
The
point of intersection of two sides of an angle or figure
|
Acute
angle
|
An
angle that measures less than 90°
|
Right
angle
|
An
angle that measures exactly 90°
|
Obtuse
angle
|
An
angle that measures between 90° and
180°
|
Straight
angle
|
An
angle that measures exactly180°
|
Complementary
angles
|
Two
angles that add up to 90°
|
Supplementary
angles
|
Two
angles that add up to 180°
|
Adjacent
angles
|
Two
angles that share a vertex
|
Vertical
angles
|
Angles
formed by two intersecting lines that are opposite each other
|
Congruent
angles
|
Angles
with equal angle measures
|
Congruent
sides
|
Sides
that have the same measure
|
Scalene
|
No
congruent sides (triangles)
|
Isosceles
|
Two
congruent sides (triangle)
|
Equilateral
|
All
sides congruent (triangles)
|
Polygon
|
A
closed figure made of only line segments
|
Regular
polygon
|
A
polygon with all sides and angles congruent
|
Irregular
polygon
|
A
polygon with sides that are not all congruent
|
Circle
|
A
set of points on a plane that are all equidistant from one point
|
Radius
|
The
distance from the center of the circle to the outside
|
Diameter
|
The
distance from one side of a circle to the other that goes through the cent
|
Arc
|
A
part of the circle (the outside)
|
Semicircle
|
Half
of a circle
|
Compass
|
A
tool used to draw circles
|
Midpoint
|
A
point the divides a line segment into two equal lengths
|
Segment
bisector
|
A
line, segment, or ray that does through the midpoint of a segment
|
Area
|
The
amount of space inside a 2d figure
|
Perimeter
|
The
distance around a polygon
|
Circumference
|
The
distance around a circle
|
Volume
|
The
amount of space inside a 3d figure
|
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