The side length of a rectangle is equal to (length+width+height) multiplied by 4. If you want to know the height of an edge, divide the sum by 4, and then subtract the length and width. The area formula of rectangle is: rectangular area = length × width.
A rectangle is a parallelogram with right angles. A rectangle is also defined as a parallelogram with four corners at right angles. In addition, a square is both a rectangle and a diamond.
The nature of the rectangle is
1, two diagonal lines are equal;
2. Two diagonal lines are equally divided;
3. Two groups of opposite sides are parallel respectively;
4. Two groups of opposite sides are equal respectively;
5. All four corners are right angles;
6. There are two symmetrical axes (there are four squares);
7. Unstable (easily deformed);
8. The square of the diagonal length of a rectangle is the sum of the squares of both sides;
9. The quadrilateral obtained by connecting the midpoints of each side of the rectangle in turn is a diamond.
The judging theorem of rectangle;
1. A parallelogram with right angles is a rectangle.
2. Parallelograms with equal diagonals are rectangles.
3. A parallelogram with adjacent sides perpendicular to each other is a rectangle.
A quadrilateral with three right angles is a rectangle.
5. Quadrilaterals with equal diagonals and bisecting each other are rectangles.