Yes you can, my daughter did and it was fine
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(35/7)*4 = 20 Ft.
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.
It works out as 12 feet and 4 inches in height
The height of the tree is in direct proportion to the pole and its shadow
A 1 foot shadow I think.