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Parallel and perpendicular lines on a plane

This online calculator checks lines' slopes to see if they are parallel or perpendicular

Parallel and Perpendicular LinesCreative Commons Attribution/Share-Alike License 3.0 (Unported)

Prospect distance from the ground and line of sight distance between two observers

Calculates the prospect distance from height at observer and line of sight distance between two observers.

Prospect distance from the ground and line of sight distance between two observersCreative Commons Attribution/Share-Alike License 3.0 (Unported)
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