MP1 Lesson 5 Classifying Angles and the Protractor Postulate

TEKS G.6A
We will classify angles.
I will summarize how to classify angles by their angle measure.

Lesson 5 Classifying Angles

Labelling

Label the bellringer with the correct answer for each question.

Drag labels to their correct position on the image

(2,-3)

(-7,3)

Multiple Choice

Given the angle in the picture, what is a possible way to label it?

• $$\angle OAB$$

• $$\angle OBA$$

• $$\angle ABO$$

• $$\angle AOB$$

Use the angles to the right to fill in the information.

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Try some examples

​Take note... These labels come back during triangles

Labelling

Label the picture according to the definitions from your notes.

Drag labels to their correct position on the image

obtuse angle

acute angle

right angle

straight angle

acute angle

obtuse angle

Works much the same way the ruler postulate does!

Dropdown

m∠ADB is ​

Select answer

m∠FDE is ​

Select answer

m∠BDC is ​

Select answer

m∠CDE is ​

Select answer

Draw the symbol on your notes

Dropdown

If m∠KJL = 30°, then m∠​

Select answer

= 30°

If m∠LMP=100°, then m∠​

Select answer

=100°

∠QHG ≅ ∠​

Select answer

Open Ended

Summarize how to classify angles and how to apply the protractor postulate.