Chapter 1 - Essentials of Geometry Section 1.4 - Measure and classify angles What the student should get from this: 1. Name and classify angles 2. Measure and construct angles and angle bisectors What始s an angle?

A B

1

Name the angle -

(interior)

(exterior) C

How many angles do you see?

Classify angles: Acute" "

"

Right"

"

Obtuse""

"

"

Straight

x

0 < x < 90

x = 180 x = 90

90 < x < 180

Angles that have the same measure are said to be _____________________. If two angles are equal in measure, how do you mark them?

Using your

, construct an angle congruent to !R .

R

Again, using your

,bisect !P .

P Now... construct right angle. (the fish)

Construct a 60Ëš angle.

Estimate the measure of the following angles:

Determine the value of x... C

m!AOB = 4x " 2 , m!BOC = 5x + 10 and m!COD = 3x " 8

B

D

E

60Ëš

A O

Assignment: p.28 #s 3, 6-10 all, 12, 14, 16, 17, 21, 22, 23, 25, 26, 29, 33-38 all, 42. Study for Quiz 1 in sections 1.1, 1.2, 1.3, & 1.4. (on Tuesday Sept. 6th.)