Not necessarily.
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It is. All sides of a geometric pyramid are flat - even stepped pyramids.
A regular pentagon has 5 equal sides. An irregularpentagon has 5 sides that are not all equal.
A rhombus has all sides equal and opposite sides parallel. This includes a square which is a special case of a rhombus with all angles equal (90 degrees) as well. If opposirte sides are equal but not all sides are equal, it is a parallelogram
No, an isosceles triangle has two sides of equal length. An equilateral triangle has all three sides of equal length.
Yes, because the number of sides of a pyramid is equal to the bottom face's number of edges times 2. Any number multiplied by two except zero is even.