Question

Find the surface area of a hollow cylinder of internal radius 3 cm wide 0.5 cm and height 7 cm

Answer 1

Answer:

154 cm^2

Step-by-step explanation:

internal radius = 3cm , wide = 0.5

so external radius = 3+0.5 = 3.5cm

circumference of the cylinder = 2 pi r = 2 * 22/7 * 3.5

=44 * 0.5 = 22 cm

height = 7cm

surface area of the hollow cylinder =  7cm * 22cm =  154 cm^2

PLS MARK ME AS BRAINLIEST

Answer 2

The surface area of a hollow cylinder is 154 square centimeter.

Step-by-step explanation:

To find : The surface area of a hollow cylinder of internal radius 3 cm wide 0.5 cm and height 7 cm ?

Solution :

The height of cylinder is h=7 cm.

The internal radius is r=3 cm.

Wide is 0.5 cm.

i.e. external radius is R=3+0.5=3.5 cm.

The surface area of a hollow cylinder is given by,

$SA=2\pi R h$

$SA=2\times \frac{22}{7}\times 3.5\times 7$

$SA=154\ cm^2$

Therefore, the surface area of a hollow cylinder is 154 square centimeter.

#Learn more

Find the surface area of the cylinders.r=49m,h=20m​

https://brainly.in/question/13817687