Because a square is a regular 4 sided quadrilateral
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its the same as all other side lengths
They must all be the same length.
Perimeter of a figure means the sum of the lengths of all the sides.A square has four sides, and in this case, the square's sides' lengths are 21 in.21 in. * 4 sides = 84 in.
Only if they are congruent triangles
A square has vertices which form 90 degree angles. Four of these can meet at a point and cover 360 degrees. This ensures than there are no wedge shaped gaps or overlaps at the points where the tessera meet. Also, the side lengths are all the same, so there are no gaps or overlaps along the side lengths.