﻿ SQUARE: perimeter, area (formula and on-line calculator)

### Calculation

Enter a value to any field - the others are calculated themselves. If you change a value in any field, the others are automatically recalculated.
For decimals you can enter either points or commas
as decimal marks (but only one decimal point in a value).

 Side length a = m Diagonal u = m Perimeter O = m Area P = m² round to 6 digits nm µm mm cm dm m km

The result will be in the units that you enter into the fields.
For example: if you enter decimeters, calculation will be also in decimeters.

If appears an error NaN, check whether you enter to the field
a correct value, ie. without any letters and other characters.

### Formula

 Perimeter square O = 4 × a [m] Area square P = a × a = a² [m²] Diagonal square u = a √2 ≈ a × 1,41 [m]

a … length of one side

u … diagonal

### The square and the circle (disc)

Diagonal (u) = Excircle diameter
Side of square (a) = Incircle diameter

### How to calculate ...

Bold shapes and objects are already in operation. The others contain only a formula.