Linear Algebra by V. V. Voyevodin
a comprehensive united course in linear #algebra and analytic #geometry; intended mainly for those in whose education computational #mathematics#soviet
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This tetrahedron has four faces. But it can rest stably on only one. Set it on any of the others on a level surface, and it tips back.
Mathematicians love abstractions. Sometimes their equations acquire a rather strange physical form.
#Geometry#Engineering
The black dots on side AB divide it into five equal segments.
Triangles ABC, CDF, and CEG are equilateral.
The area of triangle ABC is 5.
#mathpuzzle#Geometry#GeometricProblem