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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