16 * * * * * Not sure what a rectangular octagon is but no kind of octagon has more than 8 lines of symmetry.
4
2
4
Eight
6
an isosceles has only 1 line of symmetry
one. It is a vertical line of symmetry which splits the A in half.
just one
only 1
Normally none but if it's an isosceles trapezoid it has one
A rectangular solid that is not a cube has 3 planes of symmetry.