Euclid stated that all right angles are equal to each other in the form of

The Greeks emphasized on:

In the figure,if $\angle 1 = \angle 3$,$\angle 2 = \angle 4$ and $\angle 3 = \angle 4$,write the relation between $\angle 1$ and $\angle 2$,using an Euclid's axiom.

Study the following statement: "Two intersecting lines cannot be perpendicular to the same line". Check whether it is an equivalent version to Euclid's fifth postulate.

Read the following axioms:
$(i)$ Things which are equal to the same thing are equal to one another.
$(ii)$ If equals are added to equals,the wholes are equal.
$(iii)$ Things which are double of the same thing are equal to one another.
Check whether the given system of axioms is consistent or inconsistent.

State whether the following statement is true or false:
Only one line can pass through a single point.