If a 40-foot tree casts a 12-foot shadow, find the length of the shadow cast by a 21-foot tree.

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asked Apr 15, 2018 38.7k views

2 Answers

BStateham · Answer 1 · 2018-04-17T21:30:22+0000

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

If a 40-foot tree casts a 12-foot shadow, find the length of the shadow cast by a 21-foot tree.

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If a 40​-foot tree casts a 12​-foot ​shadow, find the length of the shadow cast by a 21-foot tree.

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If a 40-foot tree casts a 12-foot shadow, find the length of the shadow cast by a 21-foot tree.