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In the adjacent figure, r is the minor radius of the circle that is revolved. R is the major radius i.e. the distance between the centre of the torus and the centre of the circle that is revolved. Volume of Torus =2πR×πr2 = 2π2Rr2 Curved Surface Area (CSA) = 2πR×2πr = 4π2Rr Flat Surface Area (FSA) = 0 Total Surface Area (TSA) = 4π2Rr |
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It is given that the diameter of the smaller circle is 24 cm and the outer diameter is 32 cm. In figure 1 we can see that the remaining 8 cm of the outer diameter can be split equally to fill in the remaining portion. Volume of Torus =2π2Rr2 -----(1) Figure 2 shows the values of r and R. Where r = 24 = 2 cm and R = 12 + 24 = 14 cm. |
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