Arch vs Patna

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An arch is a vertical curved structure that spans an elevated space and may or may not support the weight above it, or in case of a horizontal arch like an arch dam, the hydrostatic pressure against it. Arches may be synonymous with vaults, but a vault may be distinguished as a continuous arch forming a roof.

Arches appeared as early as the 2nd millennium BC in Mesopotamian brick architecture, and their systematic use started with the ancient Romans, who were the first to apply the technique to a wide range of structures.

Source: Wikipedia

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Patna (listen) is the capital and largest city of the state of Bihar in India. The city of Patna had an estimated city population of 1.68 million in 2011, making it the 19th largest city in India. With an area of 250 square kilometres (97 sq mi) and population over 2 million people, the Patna urban agglomeration is the 18th largest in India. Patna serves as the seat of Patna High Court. One of the oldest continuously inhabited places in the world, Patna was founded in 490 BCE by the king of Magadha. Ancient Patna, known as Patliputra, was the capital of the Magadh Empire under the Haryanka, Nanda, Mauryan, Shunga, Gupta and Pala empires. Pataliputra was a seat of learning and fine arts. It was home to many astronomers and scholars including Aryabhata, Vātsyāyana and Chanakya. During the Maurya period (around 300 BCE) its population was about 400,000. Patna served as the seat of power, political and cultural centre of the Indian subcontinent during the Maurya and Gupta empires. With the fall of the Gupta Empire, Patna lost its glory. It was revived again in the 17th century by the British as a centre of international trade.

Following the partition of Bengal presidency in 1912, Patna became the capital of Bihar and Orissa Province.The modern city of Patna is situated on the southern bank of the river Ganges. The city also straddles the rivers Sone, Gandak and Punpun. The city is approximately 35 kilometres (22 mi) in length and 16 to 18 kilometres (9.9 to 11.2 mi) wide. In June 2009, the World Bank ranked Patna second in India (after Delhi) for ease of starting a business. As of 2015, Patna's per capita gross domestic product is ₹1,06,000 ($1581). Using figures for assumed average annual growth, Patna is the 21st fastest growing city in the world and 5th fastest growing city in India according to a study by the City Mayors Foundation. Patna registered an average annual growth of 3.72% during 2006–2010.The Buddhist, Hindu and Jain pilgrimage centres of Vaishali, Rajgir, Nalanda, Bodh Gaya and Pawapuri are nearby and Patna City is a sacred city for Sikhs as the tenth Sikh Guru, Guru Gobind Singh was born here.

Source: Wikipedia