How high up the building does the ladder reach?

Question

A 4-meter ladder is 1-meter from the base of a building.

Answer 1

the ladder reaches all the way to the top.  it hangs on the top of the building since it hangs above the ground.

Answer 2

this would be done using pythogoras theorem

let the height to which the ladder reaches be h

4^2 = h^2 + 1^2

or, h^2 = 16 - 1 = 15

so, h = sq root (15) = 3.873 m