Figures without symmetry.
Quadrilaterals, trapezium..
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Irregular and asymmetrical.
asymmetrical letters appear filpped because they dont look the same where as symmetrical letter looks same on both sides.
Strictly speaking, none, since almost all biological specimens are asymmetrical at a detailed level. Every human being has an asymmetrical face, for example. But an idealised lemon would have onle line of symmetry - along its long axis.
Congruent figures are always similar. However, similar figures are only sometimes congruent.
Coplanar figures.