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A building that is 100 ft tall casts a shadow that makes a 30 degree angle with the ground. Approximately how long, in feet, is the shadow across the ground?

User Debojyoti
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If the height of the building is 100 ft, and the angle made with the ground is 30°:
You can say that tan(30) = 100/x
Rearranging for x you get x = 173.2 ft
User Saman Salehi
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Answer: The length of the shadow is 173.2 feet long

Explanation:

Since we have given that

Length of a building = 100 feet

Angle of elevation that a shadow makes with the ground = 30°

We need to find the length of the shadow :

We will use "Trigonometric Ratios: :


(AB)/(BC)=\tan 30\textdegree\\\\(100)/(BC)=(1)/(√(3))\\\\BC=100* √(3)\\\\BC=100* 1.732=173.2\ feet

Hence, the length of the shadow is 173.2 feet long .

A building that is 100 ft tall casts a shadow that makes a 30 degree angle with the-example-1
User Lyubomyr Dutko
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