Posted by Arjun on .
A fence that is 4 metres tall runs parallel to a tall building at a distance
of 1 metre from the building. What is the length of the shortest ladder
that will reach from the ground over the fence to the wall of the building?

Maths 
Henry,
We form a rt. triangle:
X = 1 m. = Hor. side.
Y = 4 m. = Ver. side.
Z = Hyp. = Length of the ladder.
Z^2 = X^2 + Y^2
Z^2 = 1^2 + 4^2 = 17
Z = 4.1 m.