Vocabulary: Point Line Line Segment Ray Intersecting Line Perpendicular Line Parallel Line Angle

Angles Two rays share the same end point for an

ANGLE. The point where the rays intersect is called the Vertex of an angle.

The two rays are called the arms of the angle or angle arms. Angles are found wherever lines and line

segments intersect.

BC

Angles An Angle Can Be Named in Three

Different Ways by Using– Three Letters to Name, in This Order,

Example: “Angle ABC” A Point on One Ray, The Vertex, and A Point on the Other Ray;

– One Letter at the Vertex; “Angle A”– Or a Number Written Inside the Rays of the

Angle. Example: “Angle 1”

BC

AA

1

Here, are some examples:

Angle arm

Angle armVertex

A

CB

The angle is called angle ABC.

We can denote it as ABC,

⌃ ⌃ ABC , B or B.

Types of Angles

Identify the angle arms and vertex.

S

NU

V

IP

Angle arm US and UN

Vertex U

Angle SUN

Angle arm _____________

Vertex _______________

Angle ________________

Identify the angle arms and vertex.

S

TA

T

OP

Angle arm _____________

Vertex _______________

Angle ______________

Angle arm _____________

Vertex _______________

Angle ________________

M

Application for Basic Geometrical Concepts

Point S

S

Application for Basic Geometrical Concepts

F N

FN is a line

Application for Basic Geometrical Concepts

JM

JM is a ray

Application for Basic Geometrical Concepts

J

XZY is an angle

ZX and ZY are angle arms

X

Y

Z

Application for Basic Geometrical Concepts

DO is a line segment

D O

Application for Basic Geometrical Concepts

Line WX intersects Line YZ at Point O.

Z

Y

W

XO

Answer Text book pages 104 - 106

Workbook pages 96-99