11 Other formulas that you can solve using the same Inputs

Area of a regular polygon when circumradius is given
Area of regular polygon=(Radius Of Circumscribed Circle^2*Number of sides*sin((2*pi*180)/(Number of sides*pi)))/2 GO
Area of a regular polygon when inradius is given
Area of regular polygon=(Inradius of Regular Polygon^2*Number of sides*tan((pi*180)/(Number of sides*pi))) GO
Interior angle of a regular polygon when sum of the interior angles are given
Interior angle of regular polygon=Sum of the interior angles of regular polygon/Number of sides GO
Side of regular inscribed polygon
Side of regular inscribed polygon=2*Radius Of Circumscribed Circle*sin(180/Number of sides) GO
Area of a regular polygon when length of side is given
Area of regular polygon=(Side^2*Number of sides)/(4*tan((pi*180)/(Number of sides*pi))) GO
Interior angle of regular polygon
Interior angle of regular polygon=((Number of sides-2)*180)/Number of sides GO
Sum of the interior angles of regular polygon
Sum of the interior angles of regular polygon=(Number of sides-2)*180 GO
Inradius of a Regular Polygon
Inradius of Regular Polygon=(Side)/(2*tan(180/Number of sides)) GO
Radius of regular polygon
Radius of regular polygon=Side/(2*sin(180/Number of sides)) GO
Perimeter of Regular Polygon
Perimeter of Regular Polygon=Number of sides*Side GO
Measure of exterior angle of regular polygon
Measure of exterior angle =360/Number of sides GO

Number of Diagonals Formula

Diagonals=(Number of sides*(Number of sides-3))/2
More formulas
Volume of a Capsule GO
Volume of a Circular Cone GO
Volume of a Circular Cylinder GO
Volume of a Cube GO
Volume of a Hemisphere GO
Volume of a Sphere GO
Volume of a Pyramid GO
Volume of a Conical Frustum GO
Perimeter of a Parallelogram GO
Perimeter of a Rhombus GO
Perimeter of a Cube GO
Perimeter of a Kite GO
Volume of a Rectangular Prism GO
Chord Length when radius and angle are given GO
Chord length when radius and perpendicular distance are given GO
Perimeter Of Sector GO
Diagonal of a Cube GO
Perimeter Of Parallelepiped GO
Volume of Regular Dodecahedron GO
Volume of Regular Icosahedron GO
Volume of Regular Octahedron GO
Volume of Regular Tetrahedron GO
Volume of Cuboid GO
Volume of a general pyramid GO
Volume of a general prism GO
Volume of a triangular prism GO
The maximum face diagonal length for cubes with a side length S GO
Perimeter of Regular Polygon GO
Inradius of a Regular Polygon GO
Area of regular polygon with perimeter and inradius GO
Interior angle of regular polygon GO
Length of leading diagonal of cuboid GO
Volume of hollow cylinder GO
Volume of Cone GO
Fourth angle of quadrilateral when three angles are given GO
Measure of exterior angle of regular polygon GO
Sum of the interior angles of regular polygon GO
Side of regular inscribed polygon GO
Area of regular polygon with perimeter and circumradius GO
Radius of regular polygon GO
Radius of inscribed sphere inside the cube GO
Area of a regular polygon when inradius is given GO
Area of a regular polygon when circumradius is given GO
Area of a regular polygon when length of side is given GO
Interior angle of a regular polygon when sum of the interior angles are given GO
Apothem of a regular polygon GO
Apothem of a regular polygon when the circumradius is given GO
Circumradius of a regular polygon when the inradius is given GO
Perimeter of a regular polygon when inradius and area are given GO
Perimeter of a regular polygon when circumradius and area are given GO
Perimeter of a regular polygon when circumradius is given GO
Perimeter of a regular polygon when inradius is given GO
Side of a regular polygon when perimeter is given GO
Side of a regular polygon when area is given GO
Lateral edge length of a Right square pyramid when side length and slant height are given GO
Number Of Edges GO
Number Of Faces GO
Number Of Vertices GO
Distance between 2 points in 3D space GO
Distance between 2 points GO
Area of triangle given 3 points GO
Perimeter of Trapezoid GO
Area of a Heptagon GO
Perimeter of a regular Heptagon GO
Perimeter of a Hexagon GO
Perimeter of a Octagon GO
Shortest distance between two intersecting lines GO
slope of a line of the form ax+by+c=0 GO
slope of a line when equation is of the form x/a +y/b =1 GO

What is the number of diagonals in regular octagon?

An octagon has 8 sides and 20 diagonals.

How to Calculate Number of Diagonals?

Number of Diagonals calculator uses Diagonals=(Number of sides*(Number of sides-3))/2 to calculate the Diagonals, The number of diagonals is calculated by multiplying the (n-3) diagonals per vertex by the total number of vertices, n, and divided by 2 as each diagonal is counted twice. Diagonals and is denoted by D symbol.

How to calculate Number of Diagonals using this online calculator? To use this online calculator for Number of Diagonals, enter Number of sides (n) and hit the calculate button. Here is how the Number of Diagonals calculation can be explained with given input values -> 5 = (5*(5-3))/2.

FAQ

What is Number of Diagonals?
The number of diagonals is calculated by multiplying the (n-3) diagonals per vertex by the total number of vertices, n, and divided by 2 as each diagonal is counted twice and is represented as D=(n*(n-3))/2 or Diagonals=(Number of sides*(Number of sides-3))/2. The number of Sides is used to classify the polygons.
How to calculate Number of Diagonals?
The number of diagonals is calculated by multiplying the (n-3) diagonals per vertex by the total number of vertices, n, and divided by 2 as each diagonal is counted twice is calculated using Diagonals=(Number of sides*(Number of sides-3))/2. To calculate Number of Diagonals, you need Number of sides (n). With our tool, you need to enter the respective value for Number of sides and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.
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