Question

Plz solve question no 5(b) step wise fast it's urgent..........

Answer 1

Step-by-step explanation:

Given: r = 21cm

volume of cylinder = 41580cm³

To find length(circumference of cone) and breadth(height of cone)

solution:

volume of cone = πr²h

41580 = π . 21² . h

41580 = 22/7 . 441 . h

41580 x 7 / 441 x 22 = h

30 cm = h

Breadth = height = 30cm

Lateral surface area of cylinder = 2πrh

= 2 x 22/7 x 21 x 30

= 3960cm²

Area of rectangle = 2(l+b)

3960 = 2(l+30)

3960 = 2l + 60

3900 = 2l

3900 / 2 = l

1950cm = l

Length = circumference = 1950 cm