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The Ancient Greeks - and they got it right, which was more than Columbus did!
The Greek mathematician Eratosthenes calculated the circumference of the Earth fairly accurately over 2300 years ago!
Eratosthenes was the first person to do this. He measured the distance netween two points and the different angles mad by the Sun - and worked out from these. His result was surprisingly accurate.
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When would you want to find the circumference of a circle?
The first step to calculate circumference of a circle is to know the formula. There are two formulas that can be used for the purpose. They are:Circumference of a circle formula 1: C = π x diameterCircumference of a circle formula 2: C = π x 2 radiusHere are a few illustrations that would make problem solving related to finding the circumference of a circle easy:Using the Radius:If the value of the radius is known then it can be put in the 'circumference of a circle equation' already mentioned and the value calculated. For example:Given that the radius of circle is 3 cm.Circumference of the circle: C= π x 2 radiusor, C= 3.14 x 2 (3) cmor, C= 18.84 cmUsing the Diameter:If the value of the diameter is known it can be directly put in the 'circumference of a circle equation' and the circumference calculated. For example:Given that the diameter of a circle is 6 cm.Circumference of the circle: C= π x diameteror, C= 3.14 x 6 cmor, C= 18.84 cm
What is the circumference of a circle with an area of 144 pie sq in?
To find the circumference of a circle with an area of 144π sq in, we first need to find the radius of the circle. The formula for the area of a circle is A = πr^2, where A is the area and r is the radius. Given that the area is 144π sq in, we can solve for the radius: 144π = πr^2, r^2 = 144, r = 12 inches. The circumference of a circle is calculated using the formula C = 2πr, so for a circle with a radius of 12 inches, the circumference would be 24π inches.
If the circumference of a circle is 32pi what is the area of the circle?
First find the radius by dividing the circumference by 2pi which works out as 16 units. Area = pi*radius2 Area = 256pi square units
When was the first 100 digits of pi calculated?
1706
What is the circumference of a circle if its radius is 14cm?
First, we should note that the formula for circumference is Dπ, or diameter times pi. Second, we should note that the diameter is simply double the radius. With this in mind, the circumference formula can then be turned into (2r)π C=2(14)π C=28π which is about equal to 87.96459
Who invented area and circumference of a circle?
Actually, Eratosthenes of Cyrene (276? - 195? B.C.) was the first to calculate the Earth's circumference accurately. He is supposed to be the inventor.
Who was the first person to calculate the earth circumference?
The first person credited with accurately calculating the Earth's circumference was the ancient Greek mathematician and astronomer Eratosthenes in the 3rd century BC. He did so by measuring the angle of the sun's rays at two different locations and using simple geometry to estimate the Earth's size.
When was the the circumference of the Earth first measured and by who?
One possible person is Eratosthenes of Cyrene ~230 BC as he was a Greek scientist who calculated the circumference of the Earth, with remarkable accuracy (some values for the "stadia" he used gives a result within 6% of the actual polar circumference). See link for further information
Who first estimated the circumference of the Earth?
erathosthenes was the first ,
Which Indian astronomer first calculated accurately the time taken by earth to orbit sun?
Aryabhata, an ancient Indian astronomer and mathematician, was one of the first to accurately calculate the time taken by the Earth to orbit the Sun. He estimated the length of a year to be 365 days, 6 hours, 12 minutes, and 30 seconds.
What are facts on Eratosthenes?
Eratosthenes was a Greek mathematician and astronomer, named chief of the Library of Alexandria. He is recognized as the first person that calculated the circumference of Earth, he did it by his own rudimentary means and the results were quite accurate.
Who was the first person to mesure the earth's circumference?
The first person credited with measuring the Earth's circumference was the ancient Greek mathematician and astronomer Eratosthenes. He used the angle of the shadow cast by a vertical stick in Syene and Alexandria to estimate the Earth's size with impressive accuracy for his time.
Who was killed for saying that the earth is round?
The round shape of the Earth was discovered by the ancient Greeks around 500 B.C. The first proposal about the Earth's shape was from Pythagoras.
Contribution of eratosthenes?
Eratosthenes had many contributions : he was the first person to calculate the circumference of the earth he invented latitude and longitude he was the first person to prove earth was round he was the first to calculate the tilt of Earth's axis
How did the ancient Europeans use geometry?
The ancient Europeans (or more accurately, the ancient Greeks) produced the "Father of Geometry", Eratosthenes of Cyrene, born in 276 BC. He used his knowledge and discoveries in Geometry to accurately calculate the circumference of the Earth. A little later, he also accurately calculated the 'tilt' of our planet. He also correctly calculated - at a time when no-one had ever travelled there - that the poles of the earth must be very cold and that from there to the Equator the climate would gradually change from moderate to tropical. He also drew the first surprisingly correct map of the Mediterranean countries and the Middle East. He got his map so precise because he also invented the system of paralleles and meridians in geometry. This made it possible to make exact calculations of the location of any landmark on the planet and the distances between them. He also calculated that the correct duration of one year was 365 days and the necessity of leap years every 4 years.
What did eratosthenes create?
He invented the system of longitude and latitude.He was too the first person who calculate the circumference of the Earth.
Who was the first person who calculated the size of Earth using geometry?
Erasthothenes
