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Most shapes. For example, triangles, pentagons, hexagons, heptagons, 8-gons, 9-gons etc; circles, ellipses, ovals and other random meandering curves.
The vast majority of shapes. Common examples are scalene triangles, irregular quadrilaterals and n-gons of all number of sides. However, because they are irregular, their characteristics are more difficult to measure. Consequently many are not studied at school.
The angles for congruent shapes and the angles in similar shapes are all the same. All the sides are also proportional in both. Basically, all congruent shapes are similar but not all similar shapes are congruent.
A prism whose ends are 18-gons.
Irregular shapes are all around. Most shapes are irregular.