0 sides of two or more polygons that are matched so they can be compared --
1 sides of two or more polygons (= flat shapes) that are matched so they can be compared --
If there are corresponding sides, there would also be corresponding angles.
Two triangles are congruent if their corresponding sides are equal in length and their corresponding angles are equal in size.
For example, the "sine", "cosine", and "tangent" ratios in a right triangle can be remembered by representing them and their corresponding sides as strings of letters.
An image showing the corresponding sides can be found online;.
The pairs of sides are then known as corresponding sides.
It can be shown that two triangles having congruent angles ("equiangular triangles") are similar, that is, the corresponding sides can be proved to be proportional.
The corresponding sides of similar triangles have lengths that are in the same proportion, and this property is also sufficient to establish similarity.
The altitudes of similar triangles are in the same ratio as corresponding sides.
