The side faces of a pyramid are:

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

Write whether the following statement is True or False. Justify your answer.
The things which are double of the same thing are equal to one another.

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

In ancient India,the shapes of altars used for household rituals were:

Read the following statement:
An equilateral triangle is a polygon made up of three line segments out of which two line segments are equal to the third one and all its angles are $60^{\circ}$ each.
Define the terms used in this definition which you feel necessary. Are there any undefined terms in this? Can you justify that all sides and all angles are equal in an equilateral triangle?