There cannot be a similar polygon by itself. One polygon is similar to another if all of their corresponding angles are equal. This requires that the lengths of corresponding sides are in the same ratio: that is, if one polygon is a dilation of the other.
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56 (: When we say polygon abcd is similar to polygon afge, they already told you which are the lines that are similar. ab:af=bc:fg=cd:ge etc. Lines ad and af are not similar in length and therefore cannot be used to find perimeter of polygon abcd even though the perimeter of polygon afge is given.
It is 5.6
There is no limit to the number of sides.
There is no such thing as a 1-sided polygon. Proof: The sum of the measure of the interior angles of a polygon is equal to 180(n-2) where n is the number of sides in the polygon. If n=1, then the sum of the angles is 180(1-2) which is -180. Since no angle can have a negative measure, the figure cannot exist. A similar proof uses the formula for calculating the number of diagonals in the polygon, and this formula also shows that a 2-sided polygon cannot exist.