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|dw:1342078364411:dw|

Arc Length = Radius * Plane Angle
Angle must be in radians

can you help me out . i dont understand

-.-

Convert your angle to radians first. Do you know the formula for that?

I'm here for you, it's not as bad as it looks.

no thats the problem

Ok, the conversion for degrees to radians is:
\[Angle*\pi/180\]

155*pi/180
?

Correct.

2.705260341

Okay, now solve the Arc Length formula for radius

Solve the initial formula for radius:
Arc Length = radius * angle

486.9468613 = 2.705260341* 180
?

i dont understand this at alll

can yu do for me?

R = (14)/(2.705260341)

So R = ?

37.87364477
?

When I divide 14 by 2.705260341, I'm getting 5.175.
Rounded to the nearest tenth, that should be 5.2

oh whoops i accidentally mult instead of divide

so the answer is 5.175102665
?

Yes, don't forget to round to the nearest tenth though.