Post on 06-Jan-2016
description
Point
An exact location in space.
• A
Label: Point A
Line
A set of points continuing without end in both directions.
• • B C
Label: BC
Segment
Two points and the straight path between them.
• • D E
Label: DE
Endpoint
The point at the end of a segment or ray.
• • D E
Label: Point D or Point E
Ray
A set of points that has one endpoint and that extends without end in one
direction.
• • F G
Label: FG**The first letter in the label is the endpoint of the ray.
Plane
A flat surface that extends without end in all directions.
H
Label: Plane H
Parallel Lines
Lines in a plane that never touch.
• • J K
• • L M
Label: JK and LM
Intersecting Lines
Lines that meet at a point.
• • N R
• • Q P
Label: NP and QR
Perpendicular Lines
Intersecting lines that form right angles (90° angles).
• S
• • U V
• T
Label: ST and UV
Skew Lines
Lines that are in two different planes.
• T • S
• • U V
Label: ST and UV
Angle
Figure formed when two rays meet at a common endpoint.
C •
• • A B
Label: A, BAC, or CAB
Vertex
The endpoint where two rays meet.
C •
• • A B
Label: Point A
Right Angle
The measure of the angle is 90°.
• D
• • E F
Label: E, DEF, or FED
Straight Angle
The measure of the angle is 180°.
• • • G H I
Label: H, GHI, or IHG
Obtuse Angle
The measure of the angle is between 90° and 180°.
K •
• • J L
Label: J, KJL, or LJK
Acute Angle
The measure of the angle is between 0° and 90°.
N •
• • M P
Label: M, NMP, or PMN
Complementary Angles
Two angles whose measures add up to 90°.
R • • S
• • Q T
Label: RQS and SQT
Supplementary Angles
Two angles whose measures add up to 180°.
X•
• • • W V Y
Label: WVX and XVY
Adjacent Angles
Angles that have a common vertex and a common side between them.
• • B C
Z• • D
A •
Label: BZC and CZD
Vertical Angles
Angles formed by two intersecting lines and sharing only a vertex.
• • J K
M• • L
N •
Label: JMK and NML
Circle
A plane figure with all points the same distance from a given point called the
center.
K•
Label: Circle K
Center
Point in the circle that is exactly in the middle.
K•
Label: Point K
Chord
A segment with both endpoints on the circle.
D•
• E
Label: DE
Diameter
In a circle, a segment that passes through the center and has both
endpoints on the circle.G•K•H•
Label: GH
Radius
In a circle, a segment that connects the center of the circle with a point on the
circle.J•K•
Label: JK
Central Angle
An angle with its vertex at the center of a
circle.L•K•
Label: LKM
•M
Arc
Part of a circle.
L•
K•
Label: LM
•M
Polygon
A closed figure made of three or more segments.