The base of a 11 foot ladder is 2 feet from a building . if the ladder reaches the flat root , how tall is the building ?

  feet or about 10.82 feet.

Step-by-step explanation:

For the given situation , the ladder meeting the ground and the building is making right triangle with them [∵ building is standing vertical to the ground.]  

Then, by Pythagoras theorem of right triangles , we have

   (1), where l is ladder's height ,l h is building's height and b is the base .

Given : The base of a 11 foot ladder is 2 feet from a building .

i.e. l = 11 foot and b = 2 foot

Substitute the values in the above formula (1) we get

Hence, the height of building is feet or about 10.82 feet.