# What did Eratosthenes calculate?

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## What did Eratosthenes calculate?

Eratosthenes’ most famous accomplishment is his measurement of the circumference of Earth. Eratosthenes then measured the angle of a shadow cast by a stick at noon on the summer solstice in Alexandria, and found it made an angle of about 7.2 degrees, or about 1/50 of a complete circle.

## What was Eratosthenes greatest achievement?

Eratosthenes may have been the first to use the word geography. He invented a system of longitude and latitude and made a map of the known world. He also designed a system for finding prime numbers — whole numbers that can only be divided by themselves or by the number 1.

## Why do we still use Eratosthenes ideas?

Quick Guide – Eratosthenes’ Greatest Achievements Eratosthenes produced a reliable, logical method to discover prime numbers: The Sieve of Eratosthenes. In an updated form, this is still important in modern number theory. In about 240 BC Eratosthenes calculated Earth’s size with good accuracy.

## How did Greek use geometry?

“The Greeks insisted that geometric fact mush be established, … , by deductive reasoning; …” (Historical Topics, 171). They believed that geometrical truth would be found by studying rather than experimenting. They transformed the former “scientific geometry” into a more “systematic geometry”.

## What did the Greeks contribute to geometry?

Influenced initially by the Egyptians, Greek mathematicians would push on to make breakthroughs such as Pythagoras’ theory of right-angled triangles and, by focussing on the abstract, bring clarity and precision to age-old mathematical problems.

## What do the Greek symbols mean in math?

Common Greek letters used in mathematics Pi was chosen to stand for ‘perimeter’. The first 3 letters of the Greek alphabet, α (alpha), β (beta) and γ (gamma) are also used in trigonometry as variables for angles. You’ll also come across upper case gamma (Γ) as a variable, or as a function name.

## What does Lambda mean in math?

Its namesake, the Greek letter lambda (λ), is used in lambda expressions and lambda terms to denote binding a variable in a function. Lambda calculus may be untyped or typed. In typed lambda calculus, functions can be applied only if they are capable of accepting the given input’s “type” of data.

## What is Lambda equal to?

Wavelength is usually denoted by the Greek letter lambda (λ); it is equal to the speed (v) of a wave train in a medium divided by its frequency (f): λ = v/f. …