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

User Shawn McGough
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2 Answers

4 votes
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
User BStateham
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7.3k points
3 votes
The shadow Would be About 6.3 feet
User JamesonW
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7.2k points
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