I don't know how the Trig would work but in the Boy Scouts we learned to
measure the length of the shadow. Compare that to the length of a shadow
from an object of known height and figure the ratio. if a three foot ruler
casts a six foot shadow then a fifty foot shadow would go along with a 100
foot tree. 6/3 = X/50 and solve for X
That is if both shadows are measured at the same time of day ;-)
Another way is to measure the perspective. From a distance, hold up a ruler
and if a six foot man measures 3 inches high and the tree appears two feet
high. Solve the ratios again and you have the height of the tree. 6/.25 =
x/2 The tree is 48 feet high.
Lot's easier than trig.
K4IA
Buck
Fredericksburg, Virginia USA
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