Question

which of the following is correct expression for the surface area of cylindrical part of boiler ​

Answer 1

Answer:

Surface Area of a Cylinder = 2 pi r 2 + 2 pi r h

That's the top, the bottom, and the paper label that wraps around the middle. You can find the area of the top (or the bottom). That's the formula for area of a circle (pi r2). Since there is both a top and a bottom, that gets multiplied by two.

Step-by-step explanation:

plz mark it as brainliest answer

Answer 2

Answer:

hi dude

the answer is 4πr^2

Step-by-step explanation:

area of hemispherical area = 2πr^2 +2πr^2

=4πr^2