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why in the pythagorean theorem formula is it "a^2 - b^2" instead of "a^2 + b^2"

Stars and Galaxies (MindTap Course List)

10th Edition

ISBN:9781337399944

Author:Michael A. Seeds

Publisher:Michael A. Seeds

Chapter18: Modern Cosmology

Section: Chapter Questions

Problem 20RQ

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Special Relativity

The theory of special relativity discusses how space and time are related to objects traveling along a straight line at a constant speed. Simply stated, as an object reaches the speed of light, its mass becomes infinite and it is unable to move faster than light. This interstellar speed limit has been the topic of much debate in astronomy, and also in science fiction when people consider how to fly over large distances.

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why in the pythagorean theorem formula is it "a^2 - b^2" instead of "a^2 + b^2"

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