A pentagon must be a closed polygon with five straight sides and five vertices.
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pentagon has five equal sides
Equilateral just means equal sided. An equilateral pentagon is therefore a pentagon with all its sides of equal length. If an equilateral pentagon is also an equal-angled pentagon then it is called a regular pentagon.
Only if it is a regular pentagon. The pentagon is in the shape of an equal legged pentagon, but, due to human error, the pentagon's interior angles may not all be exactly equal.
A regular pentagon has 5 equal sides.
A pentagon is a plane figure bounded by five straight lines. It does not equal 180 of anything.