Déjà vu...
Anyway
With the latest set of figures from you the calcs go as per below, (this time with a diagram to try and explain):
Figures in
BLACK are taken from your post above, figures in
RED-ish are calculated as per below
The
BLUE area with the solid outline is your aquarium and the
RED-ish areas with the dotted outline are the pieces I have 'added' as per below.
So the red figures;
2 Possible ways to calculate the length of the 'sides' of the
red triangles. We will do both to double check our calculations.
1)
Pythagoras;
"On an equalateral right angle triangle the sum of the square of the two sides is equal to the sum of the hypotenuse"
Basically the length of the 'sides' of the triangle we will assume to be equal, and if you square those, and add them together, it will give the same value, as if you take the length of the diagonal and square that.
To 'fit' this rule, the sides of the triangle HAVE to be 10.8cm
2)
To Double check the calculations in 1), we will again assume that the 'front' and the 'side' of the triangles are equal lengths.
The 'flat' front of the tank is 69.5 cm, and the rear is 91.4 cm.
The difference between these 2 measurements is 21.9 cm. This is the length of front face taken up by the triangles.
As there are 2 triangles, we must divide this figure by 2.
This gives the triangle 'front' the dimension of 21.9 / 2 = 10.95 cm
Allowing for initial measurement errors these figures are close enough to be considered correct.
As can be seen from the diagram
red figures, I have used the 10.8 cm value.
Rectangular Tank Volume
We now have all the measurements for a regular rectangular tank.
The length:
91.4 cm
The Depth:
26.6 +
10.8 =
37.4 cm
The Height:
41.5 cm
Using the
CALCULATOR at the top of this page that gives a rectangular tank volume of:
142 Litres
The Missing Volume
However your tank will be less than that as we have included the
red areas in this calculation.
As the two
red triangles can be considered to be placed together, joining on the diangonals, it could produce a
red square.
The volume of this
red square can be calculated the same way as the rectangular tank:
The length:
10.8
The Depth:
10.8
The Height:
41.5 cm
Using the
CALCULATOR at the top of this page that gives a rectangular tank volume of:
5 Litres
Summary
So you have a 142L tank, with 5L missing, so your tank volume is going to be APPROXIMATELY 135 ~ 140 Litres.
This can only be approximate due to the errors always introduced when measuring, (and also I'm not sure why you measured from the top of the substrate, as the water will also be within the substrate).
The definitive way to know is to start with a dry tank and measure the water as you put it in, however as that is not a possibility for you, then the above figure should be "close enough"
NOTE: The reason that we told you it was closer to 300L in the
other thread was because you gave a measurement of the front of the tank to the back of 36.5 inches (3ft
or 92.71 cm). In the figures above it is 37.4cm (which is 14.72 inches). Quite a difference in measurements, and hence quite a difference in volume.
Looking at the measurements we have here now, and the ones you gave in the other thread, it looks like at some point on the other thread you started measuring in "cm" but stating the values on the thread in "inches"!
No worries, hopefully the above sorts it out
EDIT: This would have been here much sooner if the board hadn't been playing up! - Sorry!
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