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March 28, 2017

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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

  • math - ,

    since 6' = 72 inches, if the lamp is x inches tall,

    x/(70+90) = 72/90
    x = 128

  • math - ,

    can you further explain the part where you stated...

    x/(70+90)=72/90

    when I take 72/90 I get .8
    I must be missing something here...

  • 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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