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D angle of elevation of a building frm a measuring instruments placed on d ground is 30 degree if d building is 40m high, how far is d instrument frm d foot of d building.

  • math -

    in a 30-60-90 triangle, the sides are 1 and √3. Scale that up by 40, and the sides are 40 and 69.28

    d = 69.28 m

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