both must be proptional
Similar means they are of the same shape but not necessary the same size. two figure are congruents when they are of the same shape and size. congruent figures can be similar but not similar figures aren't always congruent
No, in general that is not true. For two similar figures it is true. But you can easily design two different figures that have the same perimeters and different areas, or the same area and different perimeters. For example, two rectangles with a different length-to-width ratio.
It is sometimes true that two parallelograms are similar. The could be congruent, or dissimilar in that one is not an enlargement of the other.
no because if they are conmgruent then they are similar
If all angles of two polygons are the same the figures are similar (irrespective of rotation).
yes. if the two figures are the same size and shape, then they are similar
Corresponding sides of similar figures are proportional.