Area and perimeter calculation

Formulas for the calculation of area and perimeter of plane figures

Article by

Category

Geometries

Published on

29 June 2023

  Figure

  Formulas

    Triangle

Perimeter
sum of sides (scalene)
oblique sides for 2 plus base (isosceles)
side for 3 (equilateral)

Area
base x height and divided product 2

   Trapezium

Perimeter
Minor base plus major base plus oblique side 1 plus oblique side 2 (scalene)
Minor base plus major base plus height side plus oblique side (rectangle)
Oblique side for 2 plus minor base plus major base (isosceles)

Area
Sum of the minor base and major base multiplied by the height and divided by 2

    Rectangle

Perimeter
Base for 2 plus height for 2

Area
Base multiplied for height

    Square

Perimeter
Side for 4

Area
Side by side

    Rhombus

Perimeter
Side for 4

Area
Minor diagonal by major diagonal and divided product 2

    Pentagon

Perimeter
Side for 5

Area
Perimeter by apothem and divided product 2

    Hexagon

Perimeter
Side for 6
Area
Perimeter by apothem and divided product 2

    Heptagon

Perimeter
Side for 7

Area
Perimeter by apothem and divided product 2

    Octagon

Perimeter
Lato per 8
Area
Perimetro per apotema e prodotto diviso 2

    Circumference

            2 for Pigreco per radius (Pigreco = 3.14)

    Circle

Area
Pigreco by radius by radius (Pigreco = 3.14)

 

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