DREPTUNGHI: perimeter, area (formula and online calculator)

Calculation

Enter values into the two yellow fields - the rest will be calculated automatically. If you change a value in the field, all the marked ones recalculate accordingly.
Using the checkbox you can choose any three fields,
that you want to calculate.
For decimals you can enter either points or commas.

Rezultatul va fi aceeași unitate pe care le introduceți în câmpurile.
For example, if you enter decimeters, the result will also be in decimeters.

Dacă există NaN, probabil
tastați în câmpurile de valori lipsite de sens.

Formulă

Perimeter dreptunghi	O =	2 × (a + b)	[m]
Surface dreptunghi	P =	a × b	[m²]
Diagonal dreptunghi	u =	√a² + b²	[m]
Angle dreptunghi	tg α =	b / a	[º]
+ reverse formulas www.wikina.org/a/Rectangle

a … side a length

b … side b length

u … diagonal

α … angle

Rectangle and circle

Diagonal (u) = diameter of a circle circumscribing a rectangle
shorter side of the rectangle (a) = diameter of a circle inscribing a rectangle

For more formulas for circumscribed or inscribed circles, see either this online calculator for circle calculation, or in encyclopedia Wikina under the article about circles here: Circle.

Other formulas are also avaiable on Wikina under the Rectangle keyword.

Online dreptunghi calculation

Calculator for calculating rectangle's surface, converting the perimeter of a rectangle, rectangle formulas. Calculation of a diameter of a circle circumscribing or inscribing a rectangle, calculation of surface from perimeter. Calculation of rectangle's perimeter online. Rectangle formulas.

Dreptunghi calculator