math

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if you are 6 ft tall and cast a 90" shadow and are standing 70" from a lamp how tall is the lamp

someone helped with this earlier (steve) but I still don't understand how you got your answer...can you please explain further?

  • math -

    draw a diagram. Two ratios are the same

    lamp height:distance to shadow tip
    person height:length of shadow

    so,
    x/160 = .8
    x = 128

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