Question

Find the radius of the earth and calculate the Circumference and also area of the earth

Answer 1

$\huge\underline\bold\red{Answer}$

• To get the radius of the earth, he divided the earth's circumference by 2 and pi. He got the radius to be 6,366 km. The radius of the Earthusing satellites is 6371 km.
• Eratosthenes divided 360° by 7.2° and got 50, which told him that the distance between Alexandria and Syene (500 miles) was 1/50The formula for the surface area area of a sphere is 4*Pi*radius squared. In conclusion, we found out that 4*Pi*radius squared is how you find the surface area of a sphere. The surface area of the Earth is approximately 510 million sq.km. of the total distance around the Earth. So he multiplied 500 by 50 to arrive at his estimate of the Earth's circumference: 25,000 miles.