VOLUME 2

Find volume of rubber in a hollow spherical ball with inner diameter20cm and outer diameter of 30cm. (π=3.14)

Solution

π=3.14, R=30cm, r=20cm, V=?

V = 4 πR³ - 4 πr³

      3           3

V = 4 π(R³ -  r³)

      3           

V = 4  x 3.14 x (30³ -  24³)

      3 

         

V = 12.56  x (27000 -  13824)

        3    

      

V = 12.56  x 13176               since [27000 -  13824=13176]

        3           

V = 12.56  x 13176 ⁴³⁹²              

        3 ₁    

V = 12.56  x 4392                

V= 55163.52cm³ .

Hence volume of Rubber is 55163.52cm³ .

TRY THIS……………………………………

Find volume of rubber in a hollow spherical ball with inner diameter15cm and outer diameter of 18cm. (π=3.14)