Calculate the amount of concrete needed for a circular slab, using metric measurements.
To make this calculation you need to know the diameter of the circle in metres and the required depth of this slab in millimetres.
Area A = π * D² ÷ 4 where A is the area in square metres, π = 3.14159265358979, D = diameter of the circle Perimeter P = π * D where P is the perimeter in metres, π = 3.14159265358979, D = diameter of circle Volume A * (d ÷ 1000) Where A is the area metres, d the depth in millimetres
Diameter of slab = 24.6 metres depth of slab = 100 millimetres
3.14159265358979 * 24.6 * 24.6 ÷ 4 = 475.29
This slab has an area of 475.29 square metres;
3.14159265358979 * 24.6 = 77.28
The circumference of the slab is 77.28 metres.
475.29 * (100 ÷ 1000) = 475.29 * 0.1 = 47.529
You need 47.529 cubic metres for this slab.