Question 1039833
Think of the light rays coming down at
a certain angle. The thing that never changes 
is the angle that the light ray makes when
it hits the ground. 
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What does change is the length of the shadow
when something gets in the way of the
light ray, but all these obstructions create
similar triangles because ( height ) / ( shadow )
will stay the same
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Let {{{ h }}} = the height of the tree
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{{{ h / 35 = 4 / 12 }}}
Multiply both sides by {{{ 12*35 }}}
{{{ 12h = 35*4 }}}
{{{ 12h = 140 }}}
{{{ h = 11.667 }}}
Convert {{{ .667 }}} ft to inches
{{{ .667*12 = 8 }}}
The height of the tree is 11 ft 8 in