"dīrghasyākṣaṇayā rajjuH pārśvamānī, tiryaDaM mānī,
cha yatpṛthagbhUte kurutastadubhayāṅ karoti."
A rope stretched along the length of the diagonal produces an area which the vertical and horizontal sides make together.
(In any right triangle, the area of the square whose side is the hypotenuse is equal to the sum of the areas of the squares whose sides are the two legs)
where c represents the length of the hypotenuse, and a and b represent the lengths of the other two sides.
The value of pi was also first calculated by Budhayana .
He discovered this in the sixth century long long before European mathematicians.
Carpenters can use it to keep their work square.
Draftsmen use it to make sure their architectural drawings are accurate.
A Engineer or electrician you could use it to estimate heights or find lengths of various things.
A physicist need to use it to calculate vectors in collisions - of subatomic particles.
If you do forensics or motor vehicle major accident investigation you might need it to calculate vectors of bigger things.
Astronomers who want to calculate the distance to the sun or the circumferences of the moon.