Answer:

Step-by-step explanation:
by using pythagorus theorem,
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Answer: 48 ft
Step-by-step explanation:
Given
Height of street light h=12 ft
length of shadow x=18 ft
Shadow length of building x'=72 ft
suppose the height of the building is y
from the figure, we can write

15376
/ I
961 16
/ I / I
31 31 4 4
31 × 4 = 124
The square root of 15376 is 124