how do i know what theta is to solve the length of an arc?

- Momo

how do i know what theta is to solve the length of an arc?

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- schrodinger

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- anonymous

Does it not give you the degree of the central angle?

- Momo

well, it's a circle...i'm not sure. i will set the problem as my profile picture lol

- anonymous

You can attach File... located at the bottom of where you post instead...

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- Momo

oh okay :D

- Momo

##### 1 Attachment

- anonymous

What are you trying to find?

- Momo

arcEDC

- anonymous

Is this a unit circle?

- anonymous

Look at the angle made up from Arc AB. There is a vertical angle equal to that angle made from Arc ED.... Do you see that those two are equal?

- Momo

they are both 50?

- anonymous

yep

- anonymous

Yes so the arc EDC that you are trying to find is a total of 90 degrees.
The arc length is found by multiplying the degrees (90) times the radius. I don't know what your radius is...

- Momo

it doesn't give me a radius...hmmm

- Momo

i could give you the multiple choice answers?

- anonymous

Yes

- Momo

45pi
45
5pi/2
5pi

- Momo

sorry, i didn't find the pi symbol. and the 3rd one is a fraction

- amistre64

this one?

- Momo

yep :)

- Momo

i have an attachment in it

- amistre64

##### 1 Attachment

- Momo

If AD=10, find the length of arcEDC

##### 1 Attachment

- Momo

oh awesome! thanks :D

- anonymous

5 * pi/2

- Momo

oh, wait sorry, 90 isn't an option

- amistre64

again; without any knowledge of the radius, there is no way to solve an arclength for this; so its most likely an angle

- Momo

jonknet, yours is an option

- anonymous

convert degrees to radians

- Momo

yeah amistre64 it is difficult

- amistre64

yes; radian measures....its good to know what the real question is :)

- anonymous

r=5. theta = 90pi/180 = pi/2. multiply out.

- amistre64

r = 5? wheres that at?

- Momo

oh thank you so much!!!

- anonymous

AD = 10

- amistre64

i see no 10 lol

- anonymous

It's not in the picture. Check Momo's response a few up.

- amistre64

ah.....

- anonymous

I almost missed it too lol

- Momo

you guys are awesome! thank you so very much!!

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