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2015-07-17T17:44:26+08:00

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The length of the shadow would be the base of a triangle and the post/tower would be the height of a triangle.

We let the base of the triangle formed by the tower be b_t and the height be h_t. Similarly let the base of the triangle formed by the post be b_p and the height be h_p.

\frac{h_t}{b_t}=\frac{h_p}{b_p}
\frac{h_t}{100}=\frac{5}{12}
12h_t=500
h_t=\frac{500}{12}=\frac{125}{3}
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