Question

How did Eratosthenes measure the size of the earth ?​

Answer 1

$\huge\mathfrak\color{red}{Question:-}$

How did Eratosthenes measure the size of the earth ?

ANSWER:-...

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. Eratosthenes then used this to calculate the circumference of the Earth to be about 250,000 stadia.