p03_004.pdf

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Chapter 3 - 3.4

4. The angle described by a full circle is 360 ◦ =2 π rad, which is the basis of our conversion factor. Thus,

(20 . 0 ◦ ) 2 π rad

360 ◦

=0 . 349 rad

and (similarly) 50 . 0 ◦ =0 . 873 rad and 100 ◦ =1 . 75 rad. Also,

(0 . 330rad) 360 ◦

and (similarly) 2 . 10rad=120 ◦ and 7 . 70rad=441 ◦ .

2 π rad =18 . 9 ◦