Question

a cuboidal fish tank has a length of 30cm and breadth of 20 and a height of 20m the tank is placed on a horizontal table and it is 3 quarters full of water find the area of the tank which is in the contact with water ​

Answer 1

Answer:

area in contact will always be l * b

Step-by-step explanation:

we can say that height will be 3/4 of the 20 cm .

area in contact = 30 * 20 = 600 sq. cm

Answer 2

Answer:

Step-by-step explanation:Cuboidal fish tank:

   Length L = 30 cm.   Breadth = B = 20 cm.    Height = H = 20 cm

   

If the tank is 3/4 th full of water, it means that it is filled up to 3/4th of its height. So water is filled upto  h = 20 cm * 3/4 = 15 cm.

Surface area of the floor of the tank = L * B = 30 * 20 = 600 cm²

Surface area of the walls of the tank up to height = h = 15 cm:

           = 2 L h  + 2 B h

           = 2 * 30 cm * 15 cm + 2 * 20 cm * 15 cm

           = 1500 cm²

Total area in contact with water = 600 + 1500 = 2, 100 sq.cm