<PRE><B>Question 34876</B>
THE LADDER CANNOT REACH HIGHER THAN THE LENGTH OF THE LADDER.

THE FORMULA FOR THIS PROBLEM IS BASE~2*HEIGHT~2=LENGTH OF THE LADDER~2

OR 9~2+HEIGHT~2=15~2 OR 81+HEIGHT~2=225 OR HEIGHT~2=225-81 OR HEIGHT~2=144 OR 

HEIGHT IS SQRT OF 144 OR HEIGHT=12 FEET 

THIS IS A STANDARD 3-4-5 OR A 9-12-15 RIGHT TRIANGLE.  
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