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Standard lettering of a triangle Area of a triangle Pythagorean theorem Three theorems of congruent triangles Figure 6: Construction for similar triangles (see text). Contrasting triangles in Euclidean, elliptic, and hyperbolic spaces. Fundamental theorem of similarity Chinese and Greek geometric theorems triangle inscribed in a circle Figure 9: If the angles of triangle ABC (representing any triangle) are trisected, then triangle DEF is equilateral.
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Photos

Standard lettering of a triangle
Area of a triangle
Pythagorean theorem
Three theorems of congruent triangles
Figure 6: Construction for similar triangles (see text).
Contrasting triangles in Euclidean, elliptic, and hyperbolic spaces.
Fundamental theorem of similarity
Chinese and Greek geometric theorems
triangle inscribed in a circle
Figure 9: If the angles of triangle ABC (representing any triangle) are trisected, then triangle DEF is equilateral.
See All Images →

Related Topics and References

Topics

Key People

Heron of Alexandria
Greek mathematician