What does Baudhayan theorem (Baudhayan Sulva Sutra) relate to?

Which Indian astrologer is known as 'Sarva Siddhanta Guru' due to explanation of Polish and Roman theories?

The Mesolithic site of Bagor is one of the most well-documented sites. It is located in:

Which of the following ports was known as 'Barygaza' to Greek and Roman traders?

With reference to the history of India, the word "kopeki" is associated with:

Eratosthenes, a Greek philosopher measured the Earth's circumference based on the angle of Sun rays at two different points. Which cities were they?