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## Homework Statement

## Homework Equations

The arc length equation?

## The Attempt at a Solution

I don't know where to begin.

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- Thread starter eXmag
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- #1

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The arc length equation?

I don't know where to begin.

Last edited:

- #2

CompuChip

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Also in your image you have drawn a vertical line stating r = 200. That line is not a radius of the circle, did you mean to put the label next to the line OB?

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- #4

CWatters

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1) From B to the center of the circle

2) From point B down to the x-axis.

Some triangles will be obvious.

I'd also mark the angle A-(center of circle)-B and call it θ

Then start with L = rθ and make substitutions. eg find a way to express θ in the required co-ordinates.

- #5

CompuChip

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I missed that, my bad.

Maybe it is slightly easier if you shift the center of the circle to the origin, which will make the coordinate of B (x - c, y) instead of (x, y), where (c, 0) is the center of the circle. Then, as I said, you will need to find [itex]\theta[/itex].

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