Question

The height of a hallow cylinders 7cm and its radius is 3.5cm. Then the surface

area is:

A] 231 cm2 B] 154 cm2 C] 308cm2 D] 115.5cm2​

Answer 1

Answer:

I think the answer is b)154cm2. I hope it's helpful for you

Answer 2

Given : radius r=3.5cm and height h=7cm

Surface area of a hollow cylinder =2πr(h+r)

=2×3.14×3.5(7+3.5)

$\bold{ = 230.79 \: cm {}^{2} ≈231}$

$\bold{∴ Surface \: area =231 \: cm^2.}$