Bellwork If Nick earns commission on his sales in

the following way: 4 % on his first $15,000and 7% on anything over $15,000. What would his sales commission be if his actual sales were $42,000?

Daily Activities

Timed Skill Drill

Homework Review

Pre-Algebra

The Angel of Angles

obj. 7.3.f

Angle Facts Angles form when two rays meet at a common endpoint. The meeting point of two rays is called the vertex.

Angles are named either by one letter assigned to the vertex (∠G) or three letters with the vertex in the center and the other two letters denoting the rays (∠RGH).

Angles are measured in units called degrees.

G

R

H(Vertex)

(Ray)

(Ray)

Angles are classified by size.

Right angles Straight angles Acute angles Obtuse angles

Right Angles Angles that measure exactly 90º

Straight Angle An angle that measures exactly 180º

Acute Angles

Angles that measure less than 90º

Obtuse Angles Angles that measure more that 90º

Acute, Obtuse, Right, Straight

Can you identify the angle?

Acute, Obtuse, Right, Straight

Can you identify the angle?

Acute, Obtuse, Right, Straight

Can you identify the angle?

Acute, Obtuse, Right, Straight

Can you identify the angle?

Acute, Obtuse, Right, Straight

Can you find all the angle types?

Other Classifications?

Complem

entarySupplem

entary

Two angles whose sum is

Two angles whose sum is

90

180

TIP:Complementary = Corner

TIP:Supplementary = Straight Line

MEASURING ANGLES

Protractors have two sets of numbers going in opposite directions.

Be careful which one you use.

Think: Should the angle I am measuring be larger than 90 or smaller?

Let’s Try!Exam

ple 1Exam

ple 2

Y N T

B

106_____

m BNTm BNY

B

TG

Z49_____

m ZTGm BTZ

EXAMPLE 3

This is an obtuse angles. We know that obtuse angles are greater than . Which scale should we use to measure “G” . Small or large? What is the measure of “G”?

90

YOU

TRY!!!Exam

ple 1Exam

ple 2

S E Z

N148_____

m ZENm SEN

G

S

X

U29_____

m UGXm SGU

YOU TRY EXAMPLE 3…

…

Find = _______

W

m W

ClosureWrite the 4 classifications

of angles (& the 2 sub-classifications)and how to tell the

difference between them.