The number of dimensions a surface has is:

If a straight line falling on two straight lines makes the interior angles on the same side of it,whose sum is $120^{\circ}$,then the two straight lines,if produced indefinitely,meet on the side on which the sum of angles is

$A$ surface is that which has $\ldots \ldots \ldots$ only.

How many dimensions does a surface have?

Solve the following question using appropriate Euclid's axiom:
It is known that $x+y=10$ and that $x=z$. Show that $z+y=10$.

State whether the following statement is True or False. Justify your answer.
The boundaries of the solids are curves.