ANSWERS

a. 89.06

Warm

-Up

s are 6.2:

6155.78 mi

b. 238,900 mi

Cla

sswork: B

ook

: pg

.48

7; 6

1-6

5 a

ll

s r

PREPRELesson 6.1 Angle Measure

Objectives:•To understand the difference between radian measure and degree measure.•To convert between radians and degrees.•To understand co-terminal angles and how to find them.•To understand arc lengths and area of sectors.

Don’t Throw

AWAYUNIT CIRCLE

Trig Vocabulary

Trig Vocabulary

Trig Vocabulary

Trig Vocabulary

Trig Vocabulary

STANDARD POSITION

An angle is in standard

position if it is

drawn with its vertex at

the origin and

its initial side on the

positive x-axis.

RELATIONSHIP BETWEEN DEGREES AND RADIANS

To convert degrees to radians,

multiply by

To convert radians to degrees,

multiply by

180 radians 1801 radian

1180

radians

180

180

1) 30

3) 120

2)3

54)6

180

6

180

60

180

2

3

180

150

5) 210

7) 300

46)

3

118)6

180

7

6

180

240

180

5

3

180

330

Ex 3. Find one positive and one negative angle that is coterminal with the angle = in standard position.

3

390 , 330

420 , 300

Classwork: Book: pg.474; 1, 3, 11, 13, 21-59 odd & 63

Classwork: Book: pg.474; 1, 3, 11, 13, 21-59 odd & 63

Classwork: Book: pg.474; 1, 3, 11, 13, 21-59 odd & 63

Classwork: Book: pg.474; 1, 3, 11, 13, 21-59 odd & 63