Question

The external surface area of a hollow cylinder is 540 Π cm².Its internal diameter is 16 cm and height is 15 cm. Find the curved surface area.

Answer 1

Answer:

the External surface area of cylinder = 540 Π cm^2

2 Π R h = 540 Π cm² Internal radius r = 16/2 = 8 cm

h = 15 cm

2*Π*R * h = 540 Π  

2 *Π *R *15 = 540 Π  

540 Π x (1/2) x (1/Π) x (1/15)

270/(15)

R= 18

Total surface area =  2 Π (R + r) (R - r + h)

2 Π (18 + 8) (18 - 8 + 15)

2 Π (26) (25)

1300 Π cm²

the total surface area of the cylinder = 1300 Π cm^2

Step-by-step explanation: