Rectangle Shape
a = length side a
b = length side b
p = q = diagonals
P = perimeter
A = area
√ = square root
Calculator Use
Use this calculator if you know 2 values for the rectangle, including 1 side length, along with area, perimeter or diagonals and you can calculate the other 3 rectangle variables. A square calculator is a special case of the rectangle where the lengths of a and b are equal.
Units: Note that units of length are shown for convenience. They do not affect the calculations. The units are in place to give an indication of the order of the calculated results such as ft, ft2 or ft3. Any other base unit can be substituted.
Rectangle Formulas
Area of a rectangle:
A = ab
Perimeter of a rectangle:
P = 2a + 2b
Polygon diagonals of a rectangle:
p = q = √(a2 + b2)
Rectangle Calculations
- Calculate A, P, p | Given a, b
Given sides lengths a and b calculate area, perimeter and diagonals- A = ab
- P = 2a + 2b
- p = q = √(a2 + b2)
- Calculate P, p, b | Given A, a
Given area and side length a calculate perimeter, diagonals and side b- b = A / a
- P = 2a + 2b
- p = q = √(a2 + b2)
- Calculate P, p, a | Given A, b
Given area and side length b calculate perimeter, diagonals and side a- a = A / b
- P = 2a + 2b
- p = q = √(a2 + b2)
- Calculate A, p, b | Given P, a
Given perimeter and side length a calculate area, diagonals and side b- b = (P - 2a) / 2
- A = ab
- p = q = √(a2 + b2)
- Calculate A, p, a | Given P, b
Given perimeter and side length b calculate area, diagonals and side a- a = (P - 2b) / 2
- A = ab
- p = q = √(a2 + b2)
- Calculate A, P, b | Given p, a
Given diagonals and side length a calculate area, perimeter and side b- b = √(p2 - a2)
- A = ab
- P = 2a + 2b
- Calculate A, P, a | Given p, b
Given diagonals and side length b calculate area, perimeter and side a- a = √(p2 - b2)
- A = ab
- P = 2a + 2b
This online calculator calculates area of convex quadrilateral (rectangles too) given coordinates of four vertices (corners)
Articles that describe this calculator
- Area of a rectangle by coordinates
Area of rectangle by coordinates
Vertices (one vertex per line, x and y coordinates separated by semicolon)
Calculation precision
Digits after the decimal point: 2
Calculators used by this calculator
- Jarvis march
Similar calculators
- • Area of a rectangle by coordinates
- • Area of a convex quadrilateral. Example of creating a calculator.
- • Area of a quadrilateral
- • Area of a Rectangle by the length of one side and the diagonal
- • Total square
- • Math section ( 298 calculators )
PLANETCALC, Area of rectangle by coordinates
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Enter for points in the plane. Mathepower calculates what quadrangle they form. A(|) B(|) C(|) D(|) | ||
Enter the coordinates of for points. Mathepower calculates what (if any) quadrangle they form A(||) B(||) C(||) D(||) |
For a rectangle with sides a and b, the following formulas hold:
Area = a*b
Perimeter = 2*a+2*b
Diagonal = square root of a�+b�
Rectangle calculation
What is a rectangle?
A rectangle has those typical properties:
It's got four sides and four corners.
The sides are perpendicular to each other, i.e. they inclose a 90�-angle.
Two opposing sides are parallel.
Opposing sides have the same length.
How to do rectangle calculations?
The interior area can be calculated as a*b where a is one side and b the other one.
The yellow line (called diagonal) has the length square root of (a^2+b^2).
If you want to see some examples, just enter your example above.
For further information, just move the mouse over one of the words above. The corresponding piece of the rectangle will then be marked.
Diagonal d
Area
Perimeter