Who has calculated the circumference of the Earth and considered the value of pi 22 7?

Aryabhatta
Explanation: Aryabhatta calculated the circumference of the earth and used Pi= 22/7 as constant in the calculation around 5th century BC.

Who first calculated the area of earth?

astronomer Eratosthenes
Earth’s circumference was first accurately measured more than 2,000 years ago by the Greek astronomer Eratosthenes, who at the time lived in the Egyptian city of Alexandria.

WHO declared Srinivasa Ramanujan National Math Day?

Minister Manmohan Singh
The mathematical genius Ramanujan was born to a Tamil Brahmin Iyengar family at Erode, Tamil Nadu. The former Prime Minister Manmohan Singh, on February 26, 2012, declared December 22 as the National Mathematics Day to mark the mathematician’s birth anniversary.

Who is the individual who Recognised and started celebrating 14 March as Pie Day?

It is marked on March 14 which if written in the format of month/day (3/14), will include the first three significant digits of the value of Pi. In 1988, Physicist Larry Shaw first recognised Pi Day. In 2009, the United States House of Representatives designated March 14 as Pi Day.

When did the Greeks calculate the circumference of the earth?

240 B.C.
240 B.C. Eratosthenes Measures the Earth. By around 500 B.C., most ancient Greeks believed that Earth was round, not flat. But they had no idea how big the planet is until about 240 B.C., when Eratosthenes devised a clever method of estimating its circumference.

What is the formula to calculate the Earth’s circumference?

The formula for calculating the circumference of a sphere is 2 x pi x radius. So, the radius of the Earth is 6371 km. Plug that into the formula, and you get 2 x 3.1415 x 6378.1 = 40,074.

Who was the first person to calculate the Earth circumference?

Eratosthenes of Cyrene was a Greek polymath: a mathematician, geographer, poet, astronomer, and music theorist. He was a man of learning, becoming the chief librarian at the Library of Alexandria. His work is comparable to what is now known as the study of geography, and he introduced some of the terminology still used today. He is best known for being the first person to calculate the circumference of the Earth, which he did by using the extensive survey results he could access in his role at t

How was Eratosthenes calculated the Earth’s circumference?

Eratosthenes will always be remembered for the calculation of the Earth’s circumference circa 240 BC, using trigonometry and knowledge of the angle of elevation of the Sun at noon in Alexandria and Syene (now Aswan, Egypt). The calculation is based on the assumption that the Earth is spherical and that the Sun is so far away that its rays can be taken as parallel.

How do you calculate the circumference of the Earth?

If you like, you can calculate the Earth’s circumference yourself. The formula for calculating the circumference of a sphere is 2 x pi x radius. So, the radius of the Earth is 6371 km. Plug that into the formula, and you get 2 x 3.1415 x 6378.1 = 40,074.

Who figured out the circumference of the Earth?

Eratosthenes ‘ Calculation of Earth’s Circumference. In 240 B.C., the Greek astronomer Eratosthenes made the first good measurement of the size of Earth.