Question

How do you find the arc length?

Answer 1

http://tutorial.math.lamar.edu/Classes/CalcII/ArcLength.aspx

Answer 2

He gives a bunch of examples in that link.

Answer 3

yeah but all ineed is an equation :P

Answer 4

It's there in the blue box

Answer 5

Here's a tutorial as well :-)

http://www.youtube.com/watch?v=tfn4cpkPHUI

Other people way smarter than me can explain it better which is why I provided links lol.

Answer 6

oh okay thank you :P

Answer 7

Do you have a particular problem you're working?

Answer 8

yes

Answer 9

this one: Find the arc length of a sector that is 125° and has a radius of 20 in.

Answer 10

Oh... so there's no function. Is this for precalc?

Answer 11

geometry :P

Answer 12

Oh okay! For some reason whenever I hear "arc length" I think of calculus.

Here you go! http://www.worsleyschool.net/science/files/sector/calculations.html

Answer 13

okay thank u hahaha

Answer 14

how did u work it?

Answer 15

Click on the link and tell me how YOU would work it :-)

Answer 16

lol k thnx

Answer 17

Wait nm. I read the instructions too fast. not 6.94

Answer 18

125/360= 2.08 the you go 2*3.14*20=125.6?

Answer 19

First find the area of the entire circle.

2*pi*20 = 40pi

Okay now divide 125degrees by 360

125/360 = 0.3472

Now multiply 0.3472 by 40pi

Arc length = 0.3472*40*pi = 43.63 in

Answer 20

"125/360= 2.08"

You must have accidentally divided 360 over 125.

Answer 21

oops okay thnk u so mcuh!

Answer 22

Sorry for the confusion :-)

Answer 23

Do you have to do anything involving finding area of a sector? B/c it looks like the link covers that as well.

Answer 24

Let x be the arc length in inches
Then,
125 is to 360 as x is to the circumference of the circle

25/72 = x/(2*pi*20)

25/72 = x / 40*pi

72 x = 25(40 pi)
x = (125/9) * pi

Answer 25

thank you