# Who found the exact value of pi?

## Who found the exact value of pi?

Archimedes of Syracuse
The first calculation of π was done by Archimedes of Syracuse (287–212 BC), one of the greatest mathematicians of the ancient world.

What did Ptolemy contribute to Alexandria?

Ptolemy made contributions to astronomy, mathematics, geography, musical theory, and optics. He compiled a star catalog and the earliest surviving table of a trigonometric function and established mathematically that an object and its mirror image must make equal angles to a mirror.

### What did Ptolemy calculate?

To facilitate astronomical calculations, Ptolemy tabulated all the data needed to compute the positions of the Sun, Moon and planets, the rising and setting of the stars, and eclipses of the Sun and Moon, making it a useful tool for astronomers and astrologers.

Who gave the most accurate approximation of pi?

The record of manual approximation of π is held by William Shanks, who calculated 527 digits correctly in the years preceding 1873. Since the middle of the 20th century, the approximation of π has been the task of electronic digital computers (for a comprehensive account, see Chronology of computation of π).

#### What value did the Chinese give pi?

From these figures he deduced an approximate value for pi of 157/50 or 3.14. He gave another value of 3927/1250 or 3.1416 which he said could be verified when calculations reached the polygon of 3,072 sides.

How did Ptolemy of Alexandria get his name?

Ptolemy of Alexandria (~100-168) gave the name to the Ptolemy’s Planetary theory which he described in his treatise Almagest. The book is mostly devoted to astronomy and trigonometry where, among many other things, he also gives the approximate value of $\\pi$ as $377/120$ and proves the theorem that now bears his name.

## What was the value of Pi in 150 AD?

as time went on other people were able come up with better approximations for pi. about 150 ad, ptolemy of alexandria (egypt) gave its value as 377/120 and in about 500 ad the chinese tsu ch’ung-chi gave the value as 355/113. these are correct to 3 and 6 decimal places respectively.

What did Ptolemy do with his astronomical models?

Ptolemy presented his astronomical models alongside convenient tables, which could be used to compute the future or past position of the planets. The Almagest also contains a star catalogue, which is a version of a catalogue created by Hipparchus.

### What was the name of Ptolemy’s birthplace in Greece?

The 14th-century astronomer Theodore Meliteniotes gave his birthplace as the prominent Greek city Ptolemais Hermiou ( Πτολεμαΐς ‘Ερμείου) in the Thebaid ( Θηβᾱΐς ). This attestation is quite late, however, and there is no evidence to support it.