Asked by karin

if you are 6 ft tall and cast a 90" shadow and are standing 70" from a lamp how tall is the lamp
Answered by Steve
since 6' = 72 inches, if the lamp is x inches tall,

x/(70+90) = 72/90
x = 128
Answered by karin
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...
Answered by Steve
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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