Check Skills

Vocabulary

Example 4: Naming Angles

Check Understandinga. Name <CED two other waysb. Would it be correct to name any of

the angles <E? Explain.A. <2, <DECB. No; 3 angles have E for a vortex, so

you need more information in the name to distinguish them from one another.

Classifying Angles

Example 5: Measuring and Classifying Angles

Check UnderstandingFind the measure of each angle. Classify each as

acute, right, obtuse, or straight.

a. 30; acuteb. 90; rightc. 140; obtuse

Using Congruent Angles

Angle Addition Postulate

Example 6: Using the Angle Addition Postulate

Check Understanding

The following questions are a review of what we covered today. They are designed to help you determine whether or not you understood the new concepts.

Please make sure you make time to come and see me if you are missing more than you are getting right!

1-4 Quiz

1. Which angle is a right angle?

A.

B.

C.

D.

2. What are the measures of and ? Classify each angle as acute, right, obtuse, or straight.

BA C

D

EG

H

FA. =45o; acute =

100o; obtuseB. =45o; acute =

90o; rightC. =55o; acute

= 100o; obtuseD. =45o; obtuse =

100o; acute

3. What are two other names for ∠2?K

LM2

N

3

A. ∠M and ∠KMLB. ∠KML and ∠NMLC. ∠LMK and ∠KMLD. ∠LMK and ∠M

4. Judging by appearance, name an acute angle, an obtuse angle, and a right angle.

U

V

W

X

Y

A. ∠W, ∠ X, & ∠ VB. ∠ V, ∠ Y, & ∠ WC. ∠ U, ∠ W, & ∠ YD. ∠ U, ∠ V, & ∠ Y

5. If and then what is the measure of The diagram is not to scale.

A. 74 B. 40 C. 54 D. 20