Find the perimeter of a rectangle with vertices calculator

Rectangle Shape

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

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 PLANETCALC, Area of rectangle by coordinates

Enter two values. Other values will be calculated. Side a: Side b: area Perimeter: diagonal

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?

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.

Rectangle calculation

How do you find the perimeter of a rectangle with vertices?

How do you find the perimeter of 4 vertices?

How is the perimeter of a rectangle calculator?