Question

A cylindrical tube needs to be painted on the inside as well as on the outside. It is open on both ends. If the diameter of the tube is 18 cm, and it is 110 cm in length, what is the total surface area of this tube whi
ch will be painted?​

Answer 1

Step-by-step explanation:

GIVEN

• Diameter of tube=18 cm
• Radius,r=18/2=9 cm
• Length of tube=height of tube=110 cm

Curved surface area of inside and outside of cylinder=

$2 \times 2 \times \pi \times r \times h \\ = 2 \times 2 \times \frac{22}{7} \times 9 \times 110 \\ = 12445.71 \: cm {}^{2}$

Thus,12445.71 cm sq. area is painted....