A7 meter ladder is leaning against a wall of a building. the foot of the ladder is 2 meters from the base of the building. how far up the wallis the top of the ladder?

Using Pythagorean's Theorem, A squared + B squared equals C squared, you can deduce the formula to be 7^2-2^2=B^2. The answer would then be the square root of 45. Hope this Helps. (^2 just means squared or the power of two.)