What make two shapes similar

Two shapes can be similar if

- all there angles are equal to each other

- two sides are in set ratio an the included angle is equal

- if a right angle is included, a hypotenuse is included and a side is in set ratio

Two figures that have the same shape are said to be similar. When two figures are similar, the ratios of the lengths of their corresponding sides are equal. To determine if the triangles below are similar, compare their corresponding sides