17.71653 inches.
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20 ft= 6096 mm (6096 * 6096) / (450 * 450) = 183.512178 184 slabs
Oh, dude, it's like basic math time. So, there are 1000 millimeters in a meter, right? So, to convert 450mm to meters, you just divide by 1000. That gives you 0.45 meters. Easy peasy lemon squeezy!
The answer will vary slightly depending on assumptions: will the slabs have a space between them, and will you be cutting the slabs to fill fractions. 21 feet is equal to 14.2 of the 450 mm slabs. 19 feet is equal to 12.9 of the slabs. To complete the rectangular area, 14.2 x 12.9 = 183 slabs.
For blocks that are 450mm x 225mm , you will need 9.88 blocks per square metre.
The volume of a cylinder (V) = πr2h, where π=pi, r=radius of the base, and h=height.Assuming the cylinder has an OUTSIDE diameter of 450mm, the INSIDE diameter is 400mm and the radius (r) is 200mm, or 0.2m. Plug in the values of your cylinder:V= 3.1415927 * 0.2m * 0.2m * 6.5m = 0.816814m3, or about816.81 Liters