Triangle -- from Wolfram MathWorld

A triangle is a 3-sided polygon sometimes (but not very commonly) called the trigon. Every triangle has three sides and three angles, some of which may be the same. The sides of a triangle are given special names in the case of a right triangle, with the side opposite the right angle being termed the hypotenuse and the other two sides being known as the legs. All triangles are convex and bicentric. That portion of the plane enclosed by the triangle is called the triangle interior, while the

Extangents Triangle -- from Wolfram MathWorld

Reuleaux Triangle -- from Wolfram MathWorld

Losanitsch's Triangle -- from Wolfram MathWorld

Monochromatic Forced Triangle -- from Wolfram MathWorld

Rhombic Hexecontahedron -- from Wolfram MathWorld

Reflection Triangle -- from Wolfram MathWorld

Octahedron -- from Wolfram MathWorld

Tangential Mid-Arc Triangle -- from Wolfram MathWorld

Central Triangle -- from Wolfram MathWorld

First Morley Adjunct Triangle -- from Wolfram MathWorld

Kimberling Center -- from Wolfram MathWorld

Triangle Centroid -- from Wolfram MathWorld

05-02-10 Akhmim Wooden Tablet --from Wolfram MathWorld

Fuhrmann Triangle -- from Wolfram MathWorld

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c Can you draw a triangle which has exactly three lines of symmetry? Sketch a rough figure.