By putting an equals sign between the 2 sides.
Ex.
2+8-1=4×2+1
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scalene has no equal sides
A regular pentagon has have equal sides. However, in the same way that a square has four equal sides but you can have a four sided figure with equal sides which is not a square, you can have pentagons that are not regular but do have equal sides. Unlike the quadrilateral, which is called a rhombus, there is no special name for a pentagon that has equal sides but not equal angles.
A parallelogram with equal sides is a rhombus.
the length of the sides on a square would be equal, a rectangle IS a quadralateral, but the sides lengthwise are not equal to the sides widthwise