220
54 meters squared
Multiply the length by the breadth. eg if slab is 2 ft by 3 ft then area of slab = 6 sq feet
A 9x9 foot slab 4 inches thick requires a minimum of 1 cubic yard. If you go to 6 inches thick you will need 1.5 cubic yards.
When talking about the area of a roof, remember that it is not the same as the square footage of the structure. For example a 20 x 30' building with a 12" overhang and a 4/12 pitch will have 736 sq ft of roof vs only 600 sq ft of slab. One square of shingles covers 100 square feet. 15 year shingles come 3 bundles to a square. 25 year come 4 bundles to a square.
21ft by 10ft
220
62 square feet.
300 square feet (25 x 12 = 300).
There are many materials that can come in different sizes like Granite, travertine, Porcelain and many more..
It depends on the thickness of slab. A yard of cement contains 9 cubic feet. Thus, it would cover 9 square feet if the slab was 1 foot thick. For a 4 inch thick slab, it would cover 3 times as much area, or 27 square feet.
15
The density of a substance is usually measured in weight units per volume (for example, per cubic foot), not per area. For a square foot... it would depend how thick the slab of granite is. That may vary between different manufacturers.
how many cubic feet in a yard of concret
15 feet x 15 feet = 225 square feet.
To determine how many cubic feet of concrete are needed, you first need to know the depth of the concrete slab. For example, if the slab is 6 inches thick, you would multiply 360 square feet by the thickness in feet (6 inches = 0.5 feet) to get 180 cubic feet of concrete required.
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