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Problem 1 - Entrance Test

A square-shaped city has an area of 20 square kilometers. What is the length of one side of the city in meters?

Correct: A

Area of a square = side × side. 20 km² = 20,000,000 m². So side² = 20,000,000 → side = √20,000,000 ≈ 4472 m.