Algebra
posted by Lola .
A 12ft tall building casts a shadow. The distance from the top of the building to the tip of the shadow is 18 ft
. Find the length of the shadow.

This sounds like a job for Pythagoras.
12^2 + b^2 = 18^2
144 + b^2 = 324
b^2 = 180
b = 13.4
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