Geometry

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

Two-sided area of rectangle
... preparation ...
a - side
b - side


2

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

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

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

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

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

The area of the rectangle across the side and the radius 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: 1 × (180/π)° = 57,296°



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


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