Rectangular area formula

A rectangle is a rectangle with at least three right angles, a parallelogram with one right angle and a parallelogram with equal diagonal lines.

A rectangle is a special parallelogram, and a square is a special rectangle. Rectangles include rectangles and squares.

Extended data:

Rectangular judgment:

1, a parallelogram with right angles is a rectangle.

2. Parallelograms with equal diagonals are rectangles.

A quadrilateral with three right angles is a rectangle.

4. Four quadrangles with equal internal angles are rectangles.

5. A parallelogram is a rectangle, and its axisymmetric figure is any set of straight lines connecting the midpoints of opposite sides.

6. For a parallelogram, if the sum of squares of the distances from one point to two pairs of vertices is equal, the parallelogram is a rectangle.

7. A quadrilateral whose diagonal is bisected and equal is a rectangle.

8. Quadrilaterals whose diagonals bisect each other and whose internal angles are right angles are rectangles.