Which of the following needs a proof?

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.

Write whether the following statement is True or False. Justify your answer.
Two distinct intersecting lines cannot be parallel to the same line.

State whether the following statement is True or False and justify your answer:
Euclid's fourth axiom states that things which coincide with one another are equal to one another.

The Greeks emphasized on:

The total number of propositions in the Elements are: