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# Question on finding distance between two points in spherical coordinates system watch

1. Part b) is ****ing me up so bad right now. Thanks, tsr.
2. This is a bit of a guess but assuming:
- as the vertical angle of the sphere,

- Path of FG is part of a cirlce with radius 5,

I took the difference of the (verticle) angle for FG as as radians.

Therefore, the arclength of a sector (of a circle) with angle is:
From this, we can derive the path length of FG.

If this is not quite correct then please state.
3. Did you manage to derive the answer?

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Updated: November 13, 2017
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