Q: Eratosthenes, a Greek philosopher, measured the Earth's circumference based on the angle of Sun rays at two different points. Which cities were they?
(a)Alexandria and Syene
(b)Syene and Troy
(c)Alexandria and Troy
(d)Alexandria and Thebes
Correct Answer: (a)
The correct answer is (d): Alexandria and Thebes. Subject: General Science | Sub-topic: Chemistry - Acids & Bases