This math topic focuses on applying the Pythagorean Theorem in three-dimensional contexts, specifically involving calculating distances or dimensions in a 3D space using 'double triangles.' The problems ask for the length of a specific side in a 3D figure given the hypotenuse distance between two points. This is intended for introductory practice in understanding how the Pythagorean Theorem extends to three dimensions, enhancing spatial reasoning and geometry skills.
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The distance from point A to point D is 7. What is the length of side BC?