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  • HomeList of all formulas of the site
  • Geometry
    • Area of plane shapes
      • Area of a triangle
      • Area of a right triangle
      • Heron's formula for area
      • Area of an isosceles triangle
      • Area of an equilateral triangle
      • Area of a triangle - "side angle side" (SAS) method
      • Area of a triangle - "side and two angles" (AAS or ASA) method
      • Area of a square
      • Area of a rectangle
      • Area of a parallelogram
      • Area of a rhombus
      • Area of a trapezoid
      • Area of an isosceles trapezoid
      • Area of a regular polygon
      • Area of a circle
      • Area of a sector of a circle
      • Area of a circular segment
      • Area of an annulus
      • Area of a sector of an annulus
      • Area of an ellipse
      • All formulas for area of plane figures
    • Surface Area
      • Surface area of a cube
      • Surface area of a rectangular prism
      • Surface area of a sphere
      • Surface area of a spherical segment
      • Surface area of a spherical zone
      • Surface area of a spherical sector
      • Surface area of a cylinder
      • Surface area of a cone
      • Surface area of a truncated cone
      • Surface area of a regular pyramid
      • Surface area of a regular truncated pyramid
      • All formulas for surface area of shapes
    • Perimeter of figures
      • Perimeter of a triangle
      • Perimeter of a rectangle
      • Perimeter of a square
      • Perimeter of a parallelogram
      • Perimeter of a rhombus
      • Perimeter of a trapezoid
      • Circumference of a circle
      • Length of an arc
      • Length of an arc, the Huygens formula
      • All formulas for perimeter of geometric figures
    • Volume of geometric shapes
      • Volume of a cube
      • Volume of a rectangular prism
      • Volume of a sphere
      • Volume of a spherical segment
      • Volume of a spherical zone
      • Volume of a spherical sector
      • Volume of a cylinder
      • Volume of a cone
      • Volume of a truncated cone
      • Volume of a pyramid
      • Volume of a truncated pyramid
      • Volume of a regular pyramid
      • Volume of a regular triangular pyramid
      • Volume of a regular quadrangular pyramid
      • Volume of a regular tetrahedron
      • All formulas for volume of geometric solids
    • Radius of a circumscribed circle
      • Triangle
      • Equilateral triangle
      • isosceles triangle
      • Right triangle
      • Square
      • Rectangle
      • Isosceles trapezoid
      • Regular hexagon
      • Regular polygon
      • All formulas for radius of a circumscribed circle.
    • Radius of a circle inscribed
      • Triangle
      • Equilateral triangle
      • Isosceles triangle
      • Right triangle
      • Square
      • Rhombus
      • Isosceles trapezoid
      • Regular polygon
      • Regular hexagon
      • All formulas for radius of a circle inscribed
    • Geometry theorems
      • The Pythagorean Theorem
      • The law of Sines
      • The law of Cosines
      • Theorems
    • Trigonometric identities
      • Sum of angles
      • Difference of angles
      • Double angle
      • Triple angle
      • Half-angle
      • Functions squared
      • Functions cubed
      • Sum of functions
      • Difference of functions
      • Product of functions
      • All basic formulas of trigonometric identities
    • Triangles
      • Side of a triangle
      • Height of a triangle
      • Bisector of a triangle
      • Median of a triangle
      • Sides of an isosceles triangle
      • Height, Bisector and Median of an isosceles triangle
      • Sides of a right triangle
      • Height of a right triangle
      • Bisector of a right triangle
      • Median of a right triangle
      • Height, Bisector and Median of an equilateral triangle
      • All geometry formulas for any triangles
    • Parallelogram
      • Sides of a parallelogram
      • Diagonals of a parallelogram
      • Angles of a parallelogram
      • Angles between diagonals of a parallelogram
      • Height of a parallelogram and the angle of intersection of heights
      • The sum of the squared diagonals of a parallelogram
      • The length and the properties of a bisector of a parallelogram
      • All formulas for parallelogram
    • Trapezoid
      • Side of a trapezoid
      • Diagonal of a trapezoid
      • Midline of a trapezoid
      • Height of a trapezoid
      • Sides of an isosceles trapezoid
      • Diagonals of an isosceles trapezoid
      • Midline of an isosceles trapezoid
      • Height of an isosceles trapezoid
      • Sides (bases) of a right trapezoid
      • Lateral sides and height of a right trapezoid
      • Diagonal of a right trapezoid
      • Midline of a right trapezoid
      • All basic formulas for trapezoid
    • Rhombus
      • Side of a rhombus
      • Diagonals of a rhombus
      • Angles of a rhombus
      • All formulas of a rhombus
    • Circle
      • Length of a chord of a circle
      • Height of a segment of a circle
      • All formulas of a circle
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All basic formulas of common geometry

Area of plane shapes

Area of a triangle
Area of a right triangle
Area of a triangle, Heron's formula
Area of an Isosceles triangle
Area of an equilateral triangle
Area of a triangle - "side angle side" (SAS) method
Area of a triangle from a side and two angles (AAS or ASA) method
Area of a square
Area of a rectangle
Area of a parallelogram
Area of a rhombus
Area of a trapezoid
Area of an isosceles trapezoid
Area of a regular polygon
Area of a circle
Area of a sector of a circle
Area of a circular segment
Area of an annulus
Area of a sector of an annulus
Area of an ellipse
All formulas of this section

Formulas for Surface Area

Surface Area of a cube
Surface Area of a rectangular prism
Surface Area of a sphere
Surface Area of a spherical segment
Surface Area of a spherical zone
Surface Area of a spherical sector
Surface Area of a cylinder
Surface Area of a cone
Surface Area of a truncated cone
Surface Area of a regular pyramid
Surface Area of a regular truncated pyramid
All formulas of this section

Formulas for Volume of a bodies

Volume of a cube
Volume of a rectangular prism
Volume of a sphere
Volume of a spherical segment
Volume of a spherical zone
Volume of a spherical sector
Volume of a cylinder
Volume of a cone
Volume of a truncated cone
Volume of a pyramid
Volume of a truncated pyramid
Volume of a regular pyramid
Volume of a regular triangular pyramid
Volume of a regular quadrangular pyramid
Volume of a regular tetrahedron
All formulas of this section

Radius of a circle inscribed

Radius of a circle inscribed in a triangle
Radius of a circle inscribed in an equilateral triangle
Radius of a circle inscribed in an isosceles triangle
Radius of a circle inscribed in a right triangle
Radius of a circle inscribed in a square
Radius of a circle inscribed in a rhombus
Radius of a circle inscribed in an isosceles trapezoid
Radius of a circle inscribed in a regular polygon
Radius of a circle inscribed in a regular hexagon
All formulas of this section

Radius of a circumscribed circle

Radius of the circumcircle of a triangle
Radius of the circumscribed circle of an equilateral triangle
Radius of the circumscribed circle of an isosceles triangle
Radius of the circumscribed circle of a right triangle
Radius of the circumscribed circle of a square
Radius of the circumscribed circle of a rectangle
Radius of the circumscribed circle of an isosceles trapezoid
Radius of the circumcircle of a regular hexagon
Radius of the circumscribed circle of a regular polygon
All formulas of this section

Perimeter of a figures

Perimeter of a triangle
Perimeter of a rectangle
Perimeter of a square
Perimeter of a parallelogram
Perimeter of a rhombus
Perimeter of a trapezoid
Perimeter of a circular disc or the circumference of a circle
Length of an arc
Length of an arc, the Huygens formula
All formulas of this section

Formulas for circle

Length of a chord of a circle
Height of a segment of a circle
All formulas of this section

Formulas for Triangle

Scalene triangle

Side of a scalene triangle
Height of a scalene triangle
Bisector of a scalene triangle
Median of a scalene triangle
 

Isosceles triangle

Sides of an isosceles triangle
Height Bisector and Median of an isosceles triangle
 

Right triangle

Sides (legs and hypotenuse) of a right triangle
Height of a right triangle
Bisector of a right triangle
Median of a right triangled
 

Equilateral triangle

Height Bisector and Median of an equilateral triangle
 
All formulas of this section
 

Parallelogram

Sides of a parallelogram
Diagonals of a parallelogram
Angles of a parallelogram
Angles between diagonals of a parallelogram
Height of a parallelogram and the angle of intersection of heights
The sum of the squared diagonals of a parallelogram
The length and the properties of a bisector of a parallelogram
All formulas of this section

Formulas for Trapezoid

Scalene trapezoid

Side of a trapezoid
Diagonal of a trapezoid
Midline of a trapezoid
Height of a trapezoid
 

Isosceles trapezoid

Side of an isosceles trapezoid
Diagonal of an isosceles trapezoid
Midline of an isosceles trapezoid
Height of an isosceles trapezoid
 

Right trapezoid

Sides (bases) of a right trapezoid
Lateral sides and height of a right trapezoid
Diagonal of a right trapezoid
Midline of a right trapezoid
 
All formulas of this section

Formulas for rhombus

Side of a rhombus
Diagonals of a rhombus
Angles of a rhombus
All formulas of this section

Trigonometric identities (sine, cosine, tangent, cotangent)

Formulas express trigonometric functions of sum of angles
Formulas express trigonometric functions of difference of angles
Formulas express trigonometric functions of double angle
Formulas express trigonometric functions of triple angle
Formulas express trigonometric functions of half-angle
Trigonometric functions squared (sine, cosine, tangent and cotangent)
Trigonometric functions cubed (sine, cosine, tangent and cotangent)
Sum of trigonometric functions (sine, cosine, tangent)
Difference of trigonometric functions (sine, cosine, tangent)
Product of trigonometric functions (sine, cosine, tangent and cotangent )
All formulas of this section

Geometry theorems

The Pythagorean Theorem
The law of sines
The law of cosines
All formulas of this section