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Area of rectangle
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 | |