If a 40-foot tree casts a 12-foot shadow, find the length of the shadow cast by a 21-foot tree.
2 answers:
Ratio and proportaion
assuming the shadow to the actual height is constant
shadow:actual height=12ft:40ft=12/40=3/10=3ft:10ft
so
3ft:10ft=?:21ft
solve
3ft/10ft=?/21ft
times both sides by 21ft
63ft/10=?
6.3ft=?
the shadow is 6.3ft
The shadow Would be About 6.3 feet
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