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

The $\ldots \ldots \ldots$ was an important manual for geometric structures in ancient India.

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.

Euclid's fifth postulate is:

In ancient India,$\ldots \ldots \ldots$ altars were used for household rituals.

Solve the following question using the appropriate Euclid's axiom:
Look at the figure. Show that the length $AH >$ the sum of the lengths of $AB + BC + CD$.