Rectangle Area Online Calculator (6 ways)

This online calculator will help you find the area of a rectangle. The solution can be found by six different methods.
Using this calculator, you can get a detailed step-by-step solution with an explanation and output of formulas. Thanks to this, you will be able to understand the algorithm for finding the area of a rectangle. You can also check the calculations that have already been performed.
  • Calculator
  • Instruction
  • Theory
  • History
  • Report a problem

Rectangle area calculation method
Side a (or b): Perimeter P:

Rectangle

A rectangle is a geometric shape that has four right angles (90°) and opposite sides are equal and parallel.
Rectangle area formula Rectangle area formula Through the perimeter and one of the sides or Rectangle area formula Through the perimeter and one of the sides where a or b - side, P is the perimeter.

Solution:
S =
P·a - 2·a2
2
=
25·5 - 2·52
2
=
125 - 50
2
=
75
2
=
37.5

a: Area of rectangle with perimeter 25 and side 5 equal to 37.5
Your score?