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

... 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: 1 radian × (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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