Your height isn't as important as the time of day of the measurement. When the sun is directly overhead, your shadow won't be measurable.
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To cast a 19 foot shadow the building would have to be 26.91 feet tall. Each foot of building/tree casts 8.47 inches of shadow.
The answer would be 56. You would square root 3136 which would give you 56.
I believe the answer is 80cm.
One seventh of 56 would be 8.
You would turn 48 in 2012.