Question

Find the length s of the arc of a circle of radius r =
19.73 cm, subtended by a central
angle which = 209 degrees

Answer 1

(209/360)(2pi)(19.73)

Answer 2

which is 71.97

Answer 3

can you help me find the exact value of (-690 degrees)

Answer 4

yes. -690 degrees = -690/180 pi radians which is -23pi/6 radians

Answer 5

the options i have are
a) 1/2
b) -1/2
c) sqrt3/2
d) sqrt2/2
e)-sqrt3/2

Answer 6

oh. was the question sin(-690 degrees) ?

Answer 7

oh it was find the exact value of cos (-690 degree)

Answer 8

ok. -690 degrees is equivalent to 30 degrees. and cos(30) = (sqrt3)/2 so c

Answer 9

how do we determine what -690 is equivalent to

Answer 10

you can always add or take away 360 degrees and it stays the same. so I just added 360 to the -690 twice and got to 30

Answer 11

basically, keep adding 360 (if you are in the negative) or taking away 360 (if positive) until you get to a number between 0 and 360.