Find the length of the radius.

Question

anonymous · Answer

|dw:1431823345431:dw|

anonymous · Answer

Is 9M the arc length, like 9 meters?

anonymous · Answer

I am guessing yes.  picture just shows 9m and since it says find the length of the radius thinking that measurement will be in meters too

anonymous · Answer

ok. so the formula you're going to use is s = rΘ, where s is the arc length and Θ is the angle in radians. Do you know how to go from degrees to radians?

anonymous · Answer

No - teacher didn't go over that.

anonymous · Answer

this is the only problem like this in homework

anonymous · Answer

book shows pi & radians / 180

anonymous · Answer

opps pi   *  radians / 180

anonymous · Answer

right. so you need to simplify
$$100 *\frac{ \pi }{ 180 }$$

anonymous · Answer

why did you drop the radians from the formula?

anonymous · Answer

I shouldn't have. radians is just a unit of measure, similar to degrees, meters, pounds, etc

anonymous · Answer

ok thanks for explaining.....
so 1.74 ??

anonymous · Answer

so S = R0
would be 9 = 1.74  ??
think I'm lost

anonymous · Answer

you're on the right track. Θ = 1.74, and s= 0, so
9 = 1.74r

anonymous · Answer

That's supposed to be s = 9

anonymous · Answer

ok that's what I thought

anonymous · Answer

so r = 5.17 is that the radius then?

anonymous · Answer

yes

anonymous · Answer

probably should use meters as form of measurement on the radius right?