Six (6) . They are
three times corner to corner, and three times each dimension (face to face).
four!
It has 1 line of symmetry
It has 1 line of symmetry or 'mirror image'
All rectangles have 2 axes of symmetry, which are the lines joined by the two pairs of midpoints of opposite sides.
two
one
cube
There are infinitely many axes of symmetry in mathematics.
a rectangle has 2 axes of symmetry
It has 5 axes of symmetry
A square has 4 axes of symmetry.
A regular pentagon has five axes of symmetry.
An isosceles triangle definitely has three axes of symmetry
Not sure about a duodecagon, but a regular dodecagon has 12 axes of symmetry.
A polygon need not have any axes of symmetry. It can have at most n axes where n is the number of sides that the polygon has.
2 axes from angles to angles
a tetrahedron has 7 axis of symmetry
It has 1 line of symmetry