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In geometry, two triangles are perspective (or homologic) if, when the sides of each triangle are extended, they meet at three collinear points. The line which goes through the three points is known as the perspectrix, perspective axis, homology axis, or axis of perspectivity. — “Perspective (geometry) - Wikipedia, the free encyclopedia”, en.wikipedia.org
Bluelinks: 0-9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z (entries removed from the above lists because they exist on Wikipedia) Homologic Triangles possibly Homologic triangles (wikisearch; web; books). — “Wikipedia:Missing science topics/Maths13 - Wikipedia, the”, en.wikipedia.org