Rectangular area formula: s = a× b.

Square perimeter formula: C=4a.

Square formula area: S=a? .

In a rectangle, a stands for length and b stands for width; A in the square represents the side length.

A parallelogram with a right angle is called a rectangle. It is also defined as a parallelogram whose four corners are right angles. At the same time, the square is a special rectangle and a diamond.

Extended data:

Area theorem

1, the area of a graph is equal to the sum of its parts.

2. The areas of two congruent figures are equal.

3. The areas of triangles, parallelograms and trapeziums with equal bases and equal heights (equal base trapezium should be understood as the sum of two bases) are equal.

4. The area ratio of equilateral triangle, parallelogram and trapezoid is equal to the corresponding height (or bottom) ratio.

5. The area ratio of similar triangles is equal to the square of the similarity ratio.

6. The ratio of the area of an equilateral or complementary triangle is equal to the ratio of the product of two sides of the equilateral or complementary triangle; The area ratio of an equilateral parallelogram is equal to the ratio of the products of two equilateral sides.

7. Any curve can be expressed by a function y=f(x), so the area surrounded by this curve is to integrate x.

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