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Problem 19 - Entrance Test

A rectangular prism has dimensions 4, 5, and 6. What is the length of the longest line segment that can be drawn within the prism?

Correct: C

The longest line segment within a rectangular prism is the space diagonal. Its length is √(l² + w² + h²) = √(4² + 5² + 6²) = √(16 + 25 + 36) = √77.