Question

The volume of a cylinder when closed at one end is 1056cm3 height is 21cm find its:
diameter
total surface area​

Answer 1

Step-by-step explanation:

diameter = 2× radius

volume of cylinder = πr^2h

volume = 1056

height= 21

π =22/7

radius =?

22/7×r^2×21= 1056

r^2 = 1056×7/21×22

r^2 = 7392/462

r^2 = 16

r=$\sqrt{16}$

r =4

therefore radius = 4cm

now diameter = 2×r

2×4= 8cm

so diameter = 8cm