The number of interwoven isosceles triangles in Sriyantra (in the Atharva Veda) is:

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

Find the solution to the equation $2x = 50$ and specify the Euclid's axiom used in it.

Solve the following question using appropriate Euclid's axiom:
Two salesmen make equal sales during the month of August. In September,each salesman doubles his sale of the month of August. Compare their sales in September.

In ancient India,altars (or vedis) with combinations of shapes like rectangles,triangles,and trapeziums were required for $\ldots \ldots \ldots$

State whether the following statement is True or False. Justify your answer.
"For every line $l$ and for every point $P$ not lying on a given line $l$,there exists a unique line $m$ passing through $P$ and parallel to $l$." This is known as Playfair's axiom.