Question

what will be the internal curved surface area of metal cylinderical pipe whose internal diameter is 4cm and length is 21 cm​

Answer 1

Answer:

264 cm²

Step- by-step explanation :

CSA of a cylinder = 2πrh

= 2*22/7 *2*21

= 44*2*3

= 264 cm²

Answer 2

Given,

internal diameter of the pipe = 4 cm

length of the pipe = 21 cm

To find,

The internal curved surface area of the pipe.

Solution,

We can simply solve this mathematical problem by using the following mathematical process.

Internal radius = 4/2 = 2 cm

Internal curved surface area = 2 × π × internal radius × height = 2 × 22/7 × 2 × 21 = 264 cm²

(In the same way we can also find the external curved surface area if the external diameter is given.)

Hence, the internal curved surface area of the pipe is 264 cm².