Question

Find the volume of iron in a 20 cm long iron pipe
whose interior and exterior diameters measure 8 cm
and 10 cm respectively. (Take pie = 3.14)​

Answer 1

Answer:

251.2cm

Step-by-step explanation:

l=20cm,R=10cm,r=8cm

volume of cylinder=πr2h

=π(R-r)2h

=3.14×(10-8)2 ×20

=3.14×(2)2 ×20

= 3.14×4×20

= 3.14 ×80

= 251.2cm

Answer 2

Answer:

565.2 cm³

Step-by-step explanation:

Height = 20 cm

R = 10/2 = 5 cm

r = 8/2 = 4 cm

-----

Volume = π (R² - r²) x h

             = 3.14 (5² - 4²) x 20

             = 3.14 (25 - 16) x 20

             = 3.14 x 20 (9)

             = 62.8 (9)

             = 565.2 cm³

Verfied .