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*Area of rectangle*, formulas for calculating the area of rectangles depending on the known source data, a calculator for finding the area online and a summary table with the area formulas of the rectangle. Our calculator will help you calculate the area of a rectangle for free online using various formulas or check already completed calculations.

Area of rectangle formulas table (at the end of the page)

1

## Two-sided area of rectangle

... preparation ...

**a**- side

**b**- side

2

## The area of the rectangle across the perimeter and one of the sides

In the specified formula, the perimeter area of the rectangle is calculated:

... preparation ...

**a**(or

**b**) - side

**P**- perimeter

3

## Diagonal and side area of rectangle

... preparation ...

**a**(or

**b**) - side

**d**- diagonal

4

## The area of the rectangle along the diagonals and the angle between them

... preparation ...

**d**- diagonal

**α°**- Angle between diagonals

5

## The area of the rectangle across the side and the radius of the circumscribed circle

... preparation ...

**a**(or

**b**) - side

**R**- circumradius

6

## The area of the rectangle across the side and the diameter of the circumscribed circle

... preparation ...

**a**(or

**b**) - side

**D**- circle diameter

Note:

If the angle is specified in radians in the source data, then for conversion to degrees you can use the formula:

## Area of rectangle formulas table

initial data (active link to go to the calculator) |
sketch | formula | |

1 | two sides | ||

2 | perimeter and one side | ||

3 | diagonal and side | ||

4 | diagonal and angle between them | ||

5 | side and radius of the circumscribed circle |
||

6 | side and diameter of the circumscribed circle |