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  1. ItsNotHSC

    Extension Question - Arcs / Radians

    Anyone know how to solve this one (q20 11I Cambridge Extension 1 Year 11): A certain hill is represented by a hemisphere of a radius 1km. A man 180cm tall walks down the hill from the summit S at 6km/h. How long (correct to the nearest second) will it be before he is invisible to a person lying...
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