Angle Notation and Types of Angles

Naming Angles

Angles are formed when two rays share the same endpoint, we call it a vertex.

Angles

An angle is the curved distance between the 2 rays. We measure this in degrees.

Angles

These are some of the most common angles we will talk about.

Labelling

Label the parts of the angle.

Drag labels to their correct position on the image

Vertex

Angle

Ray

1) The angle symbol followed by 3 letters with the vertex in the middle.
2) The vertex only
3) A number

3 ways to name an angle

Multiple Choice

This angle is written as......

•  ∠ABC

•  ∠ACB

• ∠BCA

• ∠CAB

Multiple Choice

Name the vertex of the angle.

• S

• R

• Q

• S, R, and Q are vertices

Multiple Choice

Choose the wrong name for the angle.

Multiple Choice

Choose the wrong name for the angle.

Multiple Choice

Where is the Vertex formed in the above angle?

• $$\angle D$$  

• $$\angle E$$  

• $$\Delta CDE$$  

• $$\overline{DE}$$  

Multiple Choice

Name the angle form by lines DE and EF in the long form.

• ∠D

• ∠f

• ∠FED

• ∠FDE

Multiple Choice

Name the angle form by lines KL and ML in the long form.

• ∠LMK

• ∠KML

• ∠KLM

Sometimes there are multiple angles with the same vertex. When this happens you must name an angle with 3 letters.

Caution!

Multiple Choice

If I wanted to name ∠KGL which colored angle am I talking about?

• light blue

• yellow

• blue 

• green

Multiple Choice

What is another name for ∠H

• ∠KGH

• ∠LGH

• ∠LHG

• ∠K

Multiple Choice

Choose the correct name for the angle marked $$\angle6.$$  

• $$\angle KVL$$  

• $$\angle LKV$$  

• $$\angle V$$  

• $$\angle JKV$$  

Multiple Choice

Choose the correct name for the angle marked $$\angle3.$$  

• $$\angle V$$  

• $$\angle IJV$$  

• $$\angle IVH$$  

• $$\angle JVI$$  

Naming with a number is not always an option.

Caution!

Multiple Choice

_{What is the measure of the angle?}

• 110 degrees.

• 140 degrees.

• 150 degrees.

• 169 degrees.

Multiple Choice

_{What is the measure of the following angle?}

• 102 degrees.

• 11 degrees.

• 190 degrees.

• 58 degrees.

Acute - less than 90 degrees
Right - Equal to 90
Obtuse - greater than 90
straight - equal to 180

Types of Angles

Multiple Choice

Which angle type is pictured?

• Acute

• Right

• Obtuse

• Straight

Multiple Choice

Which angle type is pictured?

• Acute

• Right

• Obtuse

• Straight

Multiple Choice

Which type of angle is pictured?

• Acute

• Right

• Obtuse

• Straight

Multiple Choice

What is the measurement of a straight angle?

• 100

• 180

• 360

• 240

Multiple Choice

What is the measurement of a right angle?

• 70

• 80

• 90

• 180

Multiple Choice

Which angle type is pictured?

• Acute

• Right

• Obtuse

• Straight