trig

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From the top of a hill 700 ft. high, an observer notes that the angles of depression of two successive markerstones on a level ground, which leads straight away from the hill are 5 degree and 15 degree respectively. Find the distance between the two markerstones.

  • trig -

    tan 15 = 700/D1

    tan 5 = 700/D2

    find D1 and D2
    subtract

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