# Volume of a obelisk Calculator

## Calculates the volume of a obelisk given the base and top sides, and height.

 A obelisk is the polyhedron formed by two parallel rectangles whose side faces are trapezoids.

 top side a top side b base side A base side B height h 6digit10digit14digit18digit22digit26digit30digit34digit38digit42digit46digit50digit volume V
 $\normal Obelisk\\(1)\ volume:\hspace{20} V={\large\frac{h}{6}}(Ab+aB+2(ab+AB))\\$

Volume of a obelisk
 [1-10] /28 Disp-Num5103050100200
[1]  2019/01/02 09:19   Male / 50 years old level / An engineer / A little /
Purpose of use
Hopper car volume calculation
Comment/Request
I found different formula that give different result.
V=h/3 (AB+ab+sqrt(AB x ab)
[2]  2018/10/01 05:42   Male / 40 years old level / Others / Very /
Purpose of use
Calculating wood chip pile
[3]  2018/03/15 12:55   Male / 40 years old level / An engineer / Useful /
Purpose of use
Volume of a hopper for a conveyor
[4]  2018/03/09 06:39   Male / 20 years old level / High-school/ University/ Grad student / Very /
Purpose of use
Calculating the volume of a sloped fish pond
[5]  2018/01/27 02:50   - / 50 years old level / High-school/ University/ Grad student / Useful /
Purpose of use
Just hobby
Comment/Request
I the formula proved / derived.

I use the formula:
V = h/4 x ( A-a) x (B-b)+ h/12 x (A-a) x (B-b)

These formula give the same result, and is easy to understand.
[6]  2017/12/09 06:09   Male / 60 years old level or over / An engineer / Very /
Purpose of use
Determine the volume of a sand house needed to contain 2,000 tons of cinders.
Comment/Request
It would be handy if one could input the angle of repose to determine a and b given h, A, B and the angle of repose. Very helpful website. Thanks
[7]  2017/10/13 19:12   Male / 60 years old level or over / A retired people / Very /
Purpose of use
Tank volume for custom fabrication of irregular shaped fuel tanks.
[8]  2017/08/26 09:26   Male / 40 years old level / An engineer / Very /
Purpose of use
calculating the volume of a rock pit
[9]  2017/06/06 21:34   Female / 30 years old level / An engineer / A little /
Purpose of use
Calculating the volume of over-stack above a wall
[10]  2017/01/28 14:42   Male / 30 years old level / An engineer / Very /
Purpose of use
calculating the volume of a conveyor belt feed hopper
Comment/Request
very usefull

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