Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ π -¹ ² ³ °

You are not logged in.

- Topics: Active | Unanswered

Pages: **1**

**MathsIsFun****Administrator**- Registered: 2005-01-21
- Posts: 7,694

Solid Geometry Formulas

"The physicists defer only to mathematicians, and the mathematicians defer only to God ..." - Leon M. Lederman

Offline

**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 28,975

Cube:-

Let the length of the cube be a.

Volume = a³ and Total Surface Area=6a²

Cuboid:-

Let the three sides of a cuboid be l, b, and h.

Volume = lxbxh. Total Surface Area = 2(lb+bh+lh)

Right Circular (Solid) Cylinder

If r is the radius of the base and top, and h is the height of the cylinder,

Volume,

Total Surface Area,

Curved Surface Area,

Cone (Solid)

If r is the radius of the base of the cone, and h its height,

its slant height is given by the formula,

l=√(r²+h²).

Curved Surface Area,

Total Surface Area,

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

**Online**

**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 28,975

Solid Sphere

Volume, V

Total Surface Area, or Surface Area,

Solid Hemisphere

Volume, V

Curved Surface Area,

Total Surface Area,

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

**Online**

**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 28,975

Hollow cylinder.

A hollow cylinder is a solid bounded by two co-axial cylinders of the same height. Let the height be h and external and internal radii be R and r.

Volume of the material used in making the hollow cylinder, V

Curved Surface Area,

Total surface Area,

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

**Online**

**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 28,975

Frustum of a Cone:-

Slant Surface area of the frustum:

where l is the slant height of the frustum.

Volume of the frustum,

where h is the height of the frustum.

Frustum of a pyramid:-

Volume,

where B1 and B2 are areas of the top and the bottom and h is its height..

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

**Online**

**luca-deltodesco****Member**- Registered: 2006-05-05
- Posts: 1,470

Torus:

A torus is a 'tube' shape, examples being a doughnut, and an inner tire, let r be the radius of the tube, and R be the distance from the centre of the torus, to the center of the tube

Surface area of the torus:

Volume of the torus:

*Last edited by luca-deltodesco (2006-06-18 07:07:18)*

The Beginning Of All Things To End.

The End Of All Things To Come.

Offline

**Zhylliolom****Real Member**- Registered: 2005-09-05
- Posts: 412

**Parallelepiped**

The volume of a parallelepiped of cross-sectional area A and height h is

or, equivalently,

where a, b, and c are the side lengths and θ is the angle between the slanted side and the horizontal.

**Slanted Cylinder**

The volume of a slanted cylinder with radius r, height h and slant height l is given by

or, equivalently,

where θ is the angle between the slanted side and the horizontal.

The lateral surface area of the slanted cylinder is given by

**Non-circular Cylinder**

The volume of a non-circular cylinder of cross-sectional area A, height h and slant height l is given by

or, equivalently,

where θ is the angle between the slanted side and the horizontal.

The lateral surface area of the non-circular cylinder is given by

where p is the perimeter of the non-circular cylinder. Note that the equations for circular cylinders may be derived from the equations for non-circular cylinders, by having A = πr² and p = 2πr.

**Pyramid**

The volume of a pyramid of base area A and height h is given by

**Spherical Cap**

The volume of a spherical cap of radius r and height h is given by

The surface area of the spherical cap is given by

**Ellipsoid**

The volume of an ellipsoid of semiaxes a, b, and c is given by

**Paraboloid of Revolution**

The volume of a paraboloid of revolution with "radius" b and height a is given by

*Note: Would it be useful if someone were to create labeled images of these shapes to aid in the visualization of them? I could make a few drawings.*

*Also, should formulas of solid analytic geometry go here as well?*

Offline

**pulidilip****Member**- Registered: 2008-03-14
- Posts: 0

Thanks Brother

Offline

**JaneFairfax****Member**- Registered: 2007-02-23
- Posts: 6,868

**Polygon**

Offline

**irspow****Member**- Registered: 2005-11-24
- Posts: 457

or...

A = s²/(4tan[180/n]) where s is length of side and n is number of sides (for those who don't want to use pi to calculate the area of a polygon)

Offline

**Monox D. I-Fly****Member**- From: Indonesia
- Registered: 2015-12-02
- Posts: 1,811

irspow wrote:

or...

A = s²/(4tan[180/n]) where s is length of side and n is number of sides (for those who don't want to use pi to calculate the area of a polygon)

Unfortunately, trigonometry tends to turn more people off than π.

Actually I never watch Star Wars and not interested in it anyway, but I choose a Yoda card as my avatar in honor of our great friend bobbym who has passed away. May his adventurous soul rest in peace at heaven.

Offline

Pages: **1**