Question

7. A cylinder is open at one end. The external
diameter is 10 cm and thickness 2 cm if the height
is 8cm (a) capacity of cylinder (b) volume of
metal used.​

Answer 1

Answer:

radius = 10/2 cm= 5 cm

external volume = (22/7×5²×8)cm³ = 628.57143cm³

internal radius = 5–2 cm = 3cm

internal volume = (22/7×3²×8)cm³ = 226.2857143 cm³

capacity = internal volume = 226.2857143 cm³

volume of metal = external volume – internal volume = 628.57143cm³ –226.2857143cm³ = 402.285716 cm³