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Geometry Tutorial: Triangles, Congruency & Types

Discusses the properties and types of triangles, explaining that a triangle is a closed figure with three sides and angles. It categorizes triangles into equilateral, isosceles, scalene, obtuse, right ...
Nature

(1) Principles of Geometry (2) Higher Geometry: An Introduction to Advanced Methods in Analytic Geometry (3) Elements of Projective Geometry

(1) CHRISTIAN VON STAUDT'S “Beiträge zur Geometrie der Lage” was published so long ago as 1857; about the year 1871 Felix Klein wrote a series of papers emphasising the fact that it is possible to ...