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A man who has something to do with triangles could be a geometry teacher, a musician in an orchestra, of a road sign maker. You may also be thinking of Pythagoras who invented the pythagorean theorum (A^2+B^2=C^2).
Infinitely many. Having found one triangle, you can find infinitely many similar triangles.
27 triangles.27 triangles.27 triangles.27 triangles.
Triangles without right angles are:- Scalene triangles Obtuse triangles Isosceles triangles Equilateral triangles
Triangles are equilateral triangles only when all of their 3 sides are equal in lengths.