Rectangle, a mathematical term, is a parallelogram with right angles called rectangle. It is also defined as a parallelogram with four right angles, and a square is both a rectangle and a diamond.
Definition of length and width of a rectangle: the long side of a rectangle is called length and the short side is called width.
A quadrilateral with four equal sides and four right angles is a square. The two groups of squares have parallel opposite sides and equal four sides; All four angles are 90 degrees; Diagonal lines are perpendicular, bisected and equal to each other, and each diagonal line bisects a set of diagonal lines.
Extended data:
Common formulas for rectangular squares:
1, the perimeter of the rectangle = (length+width) ×2 C=(a+b)×2.
2. The circumference of a square = side length ×4 C=4a.
3. Area of rectangle = length× width S=ab
4. Area of a square = side length × side length S = a× a.
Judgment theorem of square;
1, the parallelograms whose diagonals are perpendicular to each other and equal are squares.
2. A quadrilateral with equal diagonal and perpendicular is a square.
3. A set of quadrilaterals with equal adjacent sides and three right angles is a square.
4. A quadrangle that is both a diamond and a rectangle is a square.