Question

find the area of the sheet required to make 10 cylindrical each of radius 4 cm and its height is 3 metre by is equals to 22 into 7​

Answer 1

Answer:

Step-by-step explanation:

Exercise 13.1

Q.1.   Two cubes each of volume 64 cm3 are joined end to end. Find the surface area of the resulting cuboid.Sol. Volume of each cube = 64 cm3        ∴ Total volume of the two cubes = 2 × 64 cm3              = 128 cm3        Let the edge of each cube = x        ∴ x3 = 64 = 43        ∴ x = 4 cm        Now, Length of the resulting cuboid l = 2x cm              Breadth of the resulting cuboid b = x cm              Height of the resulting cuboid h = x cm        ∴ Surface area of the cuboid = 2 (lb + bh + hl) = 2[(2x . x) + (x . x) + (x . 2x)]              = 2[(2 × 4 × 4) + (4 × 4) + (4 × 2 × 4)] cm2              = 2 [32 + 16 + 32] cm2 = 2[80] cm2 = 160 cm2