How many dimensions does a solid have?

State whether the following statement is true or false:
Two distinct lines cannot have more than one point in common.

Which of the following needs a proof?

The side faces of a pyramid are:

Consider the following statement: "There exists a pair of straight lines that are everywhere equidistant from one another." Is this statement a direct consequence of Euclid's fifth postulate? Explain.

In the figure,we have: $AC = XD$,$C$ is the mid-point of $AB$ and $D$ is the mid-point of $XY$. Using Euclid's axiom,show that $AB = XY$.