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# 7.2 Radian Measure - PowerPoint PPT Presentation

7.2 Radian Measure. Radian. Units of measure for angles: revolution, degree, & radian. Radian: a central angle has measure 1 radian if it intercepts an arc with length equal to the radius of the circle. r. r.  = 1 radian. . r. Converting. 1 revolution = 360  = 2  radians.

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Presentation Transcript

Units of measure for angles:

Radian: a central angle has measure 1 radian if it intercepts an arc with length equal to the radius of the circle

r

r

r

1 revolution = 360 = 2 radians

(Circumf. of Circle = 2r)

Leave radian measure in terms of 

(round to 4 dec. places)

Change to decimal degrees

90

60

120

45

135

30

150

180

360

0

330

210

225

315

240

300

270

#703 Pg. 393 1 – 31 odd &

Memorize chart on Pg. 390