It can be. For example a square with an isosceles triangle of top has a bilateral symmetry.
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A pentagon can be regular or irregular.
No. By definition a pentagon must have 5 edges. An irregular pentagon is a pentagon that has edges with lengths of different sizes. The internal angles of all vertices will not be identical in an irregular pentagon.
an irregular pentagon has five sides but the sides are not equal
A pentagon can have:none (regular or irregular pentagon)one, two or three right angles (irregular pentagon).
In general, NO.