\"\"

\

A \"\"-foot extension ladder learing against buliding makes \"\" angle with the ground.

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\"\"

\

Observe the figure : \"\" and \"\".

\

Consider, Height of building is \"\".

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For a right angle triangle :

\

Let \"\" and \"\".

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Consider the trigonometric functions:  \"\" and \"\".

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Substitute \"\", \"\" and \"\".

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\"\"

\

\"\"

\

\"\"

\

Therefore, \"\".

\

Height of building wher ladder touches building is \"\".

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\"\"

\

Height of building wher ladder touches building is \"\".