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A globe representing the earth has a radius 0.5m. Points A `(0^0, 10^0W)`, B `(0^0, 35^0E)`, P `(60^0N, 110^0E)` and Q `(60^0N, 120^0W)` are marked on the globe.
(a) Find the length of the arc AB, leaving your answer in terms of `pi`
(b) If O is the centre of the latitude 600N, find the area of the minor sector OPQ.