Posted by Cas' on Sunday, January 16, 2011 at 2:33am.
let the height of the post be h ft, let the length of the shadow be x
when angle is 45°, the height of the post and its shadow would be equal, so x = h at 45°
at 30°, length of shadow = h+6
tan 30 = h/(h+6)
1/√3 = h/(h+6)
√3h = h + 6
√3h - h = 6
h(√3 - 1) = 6
h = 6/(√3 - 1) = appr. 8.2 ft
√3h - h =
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