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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 for parallelogram

sides litle diagonals litle angle parallelogram litle angle diagonals litle
Sides of
parallelogram		 Diagonals of
parallelogram		 Angles of
parallelogram		 Angles
between
diagonals
height litle sum diagonals2 litle bisector litle  
Height of
parallelogram		 The sum of
the squared
diagonals		 Bisector of
parallelogram

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

Geometry

  • Area of plane shapes
  • Surface Area
  • Perimeter of figures
  • Volume of geometric shapes
  • Radius of a circumscribed circle
  • Radius of a circle inscribed
  • Geometry theorems
  • Trigonometric identities
  • Triangles
  • Parallelogram
  • Trapezoid
  • Rhombus
  • Circle