Question

The surface area of a cylindrical pillar is 264 m square and it’s volume is 924 m cube the diameter of the pillar is

Answer 1

Answer:

DIAMETER = 14cm

Step-by-step explanation:

CSA of cylinder = 2πrh = 264

                              2x 22/7xrh = 264

                             rh = 264x 7 / 2 x 22

                              rh = 42

                              h= 42 /r ...(1)

Volume of cylinder = πr^2 h

924 = 22/7 x r^2 x 42/r                 (from 1)

924 = 22/7 x r x 42

r = 924 x 7 / 22 x 42

therefore, r = 7 cm

DIAMETER = 2r

                    = 2 x 7

                      = 14cm