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

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    Part b) is ****ing me up so bad right now. Thanks, tsr.

    This is a bit of a guess but assuming:
    -  \theta 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  30^{\circ}, as  90^{\circ} - 60^{\circ} = 30^{\circ} = \pi / 6 radians.

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

    If this is not quite correct then please state.

    Did you manage to derive the answer?
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