All formulas for perimeter of geometric figures

Perimeter of a triangle

perimeter triangle

 

 

a , b , c blue    -  sides of a triangle

 

 

Calculate the Perimeter of a triangle ( P ) :

perimeter triangle F

 

 

Perimeter of a rectangle

perimeter rectangle

 

 

a , b    -  sides of a rectangle

 

 

Calculate the Perimeter of a rectangle ( P ) :

perimeter rectangle F

 

 

Perimeter of a square

perimeter square

 

a    -  side of a square

 

 

 

Calculate the Perimeter of a square ( P ) :

perimeter square F

 

 

Perimeter of a parallelogram

perimeter parallelogram

 

 

a , b    -  sides of a parallelogram

 

 

Calculate the Perimeter of a parallelogram ( P ) :

perimeter parallelogram F

 

 

Perimeter of a rhombus

perimeter rhombus

 

 

a    -  side of a rhombus

 

 

Calculate the Perimeter of a rhombus ( P ) :

perimeter rhombus F

 

 

Perimeter of a trapezoid

perimeter trapezoid

 

 

    a , b , c , d black   -  sides of a trapezoid

 

 

Calculate the Perimeter of a trapezoid if given all four sides ( P ) :

perimeter trapezoid F

 

 

Perimeter of a circular disc or the circumference of a circle

circumference circle

 

rr1 red  -  radius

D green  -  diameter

pi1   3,14

 

Calculate the the length of a circle if given radius or diameter ( L ) :

circumference circle Fr   circumference circle Fd

 

 

Length of an arc

length arc

 

rr1 red  -  radius

alpha blue  -  angle of the sector AOB

pi1    3,14

 

Calculate the Length of an arc if given radius and angle of the sector in degrees ( L  ) :

length arc F

 

 

Length of an arc, the Huygens formula

length arc Huygens formula

M14 red  -  chord   AB

m12 blue  -  chord  AD=DB

The point C divides the segment AB in half

The angles ACD and DCB are right angles (90°)

 

Calculate the Length of an arc by the Huygens formula ( L  ) :

length arc Huygens formula F

*Accuracy for the angles less than 60° is less than 0.5%