A unit square has dimensions of 1 cm by 1 cm.
A quadrilateral is a polygon with four sides and four angles. A square is a quadrilateral in which all its sides are equal to each other. Hence, a square also have four equal angles measuring 90 degrees each.
The diagonals of a square are equal to each other and bisect each other.
A unit square is a square in which each of its sides measure 1 unit of measurement.
Hence in this case, since the unit of measurement is the cm, hence the unit square is a square in which all the sides measure 1 cm. That is 1 cm by 1 cm square.
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