what is the exact length of AB

https://media.glynlyon.com/g_geo_2012/13/img_geou13a_66.gif

Question

what is the exact length of AB

https://media.glynlyon.com/g_geo_2012/13/img_geou13a_66.gif

anonymous · Answer

a. 4πm
b. 6πm
c. 8πm
d. 12πm

anonymous · Answer

i think it's a cause the radius is 4?

anonymous · Answer

Wait...what is AB the straight line segment? Or the curved segment?

anonymous · Answer

the curved

jdoe0001 · Answer

$$
s= arc\
s = r	heta \ \ \ 	ext{ angle should be in radians}\
hint: 90^o = \cfrac{\pi}{2} \ radians
$$

anonymous · Answer

@jdoe0001 I'm with you on this one, but if the radius is four...then the acr lenght is 2pi, which isn't a choice... :/

jdoe0001 · Answer

I... noticed that :|, which makes me think is not the "arc" what's being asked then

anonymous · Answer

i just said the radius is 4 cause its on the straight line that goes to the middle . _. i could be wrong...

anonymous · Answer

OHOHOH WAIT, no it's like THE BIG outer curve, not the curve that we are imagining

jdoe0001 · Answer

that part looks right

anonymous · Answer

So the angle is actually 3 pi /2  okay haha

anonymous · Answer

so its b?

anonymous · Answer

Yes!

anonymous · Answer

ok thanks c: now i gotta decide who gets best response...

jdoe0001 · Answer

ohhh, har har har

anonymous · Answer

Yeah, for some reason me and you were thinking the same thing. Now I feel so silly for not just using the figure.

jdoe0001 · Answer

hint: $270^o = \frac{3\pi}{2}$  hhehe