The total number of propositions in the Elements are:

It is known that if $x+y=10$,then $x+y+z=10+z$. The Euclid's axiom that illustrates this statement is:

Read the following statement:
"$A$ square is a polygon made up of four line segments,out of which,length of three line segments are equal to the length of fourth one and all its angles are right angles".
Define the terms used in this definition which you feel necessary. Are there any undefined terms in this? Can you justify that all angles and sides of a square are equal?

Euclid's second axiom is:

How many dimensions does a surface have?

The word $\ldots \ldots \ldots$ is used for the line segment by Euclid.