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That all depends upon what time of day the shadow was cast. For example, at straight up noon, even a very tall building wouldn't cast much of a shadow, but at sunrise or sunset, even a tiny building might cast an 18 foot long shadow, or even longer.

Q: How tall would a house be that casts a 18 feet long shadow?

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2

25 feet tall

5.5/8 = x/20 x=5.5*20/8 = 13.75 feet

50 feet

6 feet

Related questions

To cast a 19 foot shadow the building would have to be 26.91 feet tall. Each foot of building/tree casts 8.47 inches of shadow.

2

28 feet

A 1 foot shadow I think.

25 feet tall

37.2 ft

It is 90 feet in height

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21 ft how is the equation to give you this result

5.5/8 = x/20 x=5.5*20/8 = 13.75 feet

50 feet