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Alektorophobia is the fear of chickens; particularly the eggs and feathers either alive or dead.
Not necessarily. A rhombus is an equilateral quadrilateral but does not have a line of symmetry. An irregular octagon does not, either.
7 divided by any positive number (not necessarily an integer) smaller than 10 or any number larger than 7 (not necessarily an integer) divided by 10. Equivalent fractions of either set of the above numbers.
The sides of a geometrical figure, particularly a triangle, can be called either arms or legs. Arms is more commonly used.
Yes. A vector is defined as having magnitude and direction (in reference to a fixed frame). Changing either of these properties redefines the vector.