 Two polygons are said to be similar if:1) The corresponding angles are congruent
2) The lengths of their corresponding sides
are proportional

Remarks:-
a)
Scale Factor
“K“
K>1
K=1
0<K<1
Enlargement
Congruent
Shrinking
b) The congruent polygons are similar but it is not necessary that similar
are congruent.
c) If each of two polygons is similar to 3rd then they are similar.
d) All regular polygons of the same number of sides are similar.
e) The ratio between the perimeter of two similar polygons = the ratio of
two corresponding sides of them.
1
1)
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2)
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3)
4)
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2
1)
3
2)
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3)
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4)
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5)
4