The seven sides, in order, must be congruent, as must the seven angles.
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They are only congruent if they are also the same size. Otherwise they are merely similar.
A rhombus is a quadrilateral that has four congruent sides. It makes a parallelogram. Not all parallelograms have 4 congruent sides. Some have two pairs of opposite sides congruent.
Only if the congruent angle is the angle between the two congruent sides (SAS postulate).
Nine. Two heptagons (septagons) and 7 rectangles.
All seven sided polygons are known as "heptagons". Heptagons that have all side lengths the same are known as "regular heptagons".