if something is same size, same shape means that it is congruent or symmetrical.
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If you put a mirror in the middle of the shape you should have the same shape on either sides.
An octogan It wouldn't be an octogan unless all the sides were the same length. OCTO means 8
an irregular shape
An irregular* pentagon *means that the sides are not all the same length
It's a shape with many sides where all the sides are the same length.