A central angle measuring 120° intercepts an arc in a circle whose radius is 3.

What is length of the arc of the circle formed by this central angle? Round the length of the arc to the nearest hundredth of unit.
6.28 units
12.57 units
9.42 square units
6.28 degrees

Question

A central angle measuring 120° intercepts an arc in a circle whose radius is 3.

What is length of the arc of the circle formed by this central angle? Round the length of the arc to the nearest hundredth of unit.
6.28 units
12.57 units
9.42 square units
6.28 degrees

anonymous · Answer

42 Square units. :)

campbell_st · Answer

you are after arc length... not area

anonymous · Answer

Lol thank you , but that choice isnt up there.

campbell_st · Answer

what fraction of the circle does an angle of 120 form..?

anonymous · Answer

wait what?

campbell_st · Answer

so an angle of 120 if what fraction of the circle... or revolution...?

anonymous · Answer

idk

campbell_st · Answer

ok... here is what you need

|dw:1434486024769:dw|

a circle is 360 degrees

so 

$$Arc ~Length = \frac{\theta}{360} \times 2 \pi r$$