What is the length of RST in centimeters? I picture is posted below so my question can be understood.

Question

elisaneedshelp · Answer

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elisaneedshelp · Answer

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elisaneedshelp · Answer

@iPwnBunnies can you? please or your tired of helping

ipwnbunnies · Answer

Ok, this one is easier. RST refers to the arclength of the between those points.
Formula is:
$$arc length = r*\theta$$
Where 'r' is the radius of the circle and theta is the angle of the circle in RADIANS.

ipwnbunnies · Answer

You know a circle is 360 degrees, and 120 degrees is a slice formed by TPR. We are looking for the arc length by the remaining circle, this part. http://prntscr.com/3kinso

ipwnbunnies · Answer

Make sure to convert the angle to radians. Multiply by pi/180.

elisaneedshelp · Answer

i mustve done something wrong and not followed what you said i did 120xpi/180 and i got 2pi/3

ipwnbunnies · Answer

No, that's the slice they mentioned was 120 degrees. That's not what we're looking at. We're looking at the remaining part of the circle. So the angle will be 360 - 120 degrees.

elisaneedshelp · Answer

ok so now i did 240xpi/180 and i got 4pi/3

ipwnbunnies · Answer

Tru. So, now, sure the formula I gave you. The radius is 4 cm. They want the arc length in cm too.

elisaneedshelp · Answer

16pi/3

ipwnbunnies · Answer

Tru. B)

elisaneedshelp · Answer

Cool Are there any traps you can help me out with?

ipwnbunnies · Answer

Well, you fell into the trap. Not reading the instructions that well. They wanted the arc length created by points RST, not the arc length of the given slice.
Plus, I guess remember the formula.