Question

A rectangular piece of paper is 22 cm in length and 10 cm in width . it is rolled into a cylinder along its length . find the surface area of this cylinder ​

Answer 1

Answer:

Step-by-step explanation:

Circumference of circle = l of rectangle

R=c/2(π)

=22*7/44=7/2

Total area=22/7*72*10+2*22/7*7/2

Area=132cm^2

Answer 2

Length of paper =Circumference of circle = 22cm
Width of paper = height of cylinder =10cm

Then,
Circumference = 22cm
2 x (22/7) x r =22
r =7/2 = 3.5 cm
Now,

Curved surface area of cylinder = 2 x 22/7 x r x h
= 2 x 22/7 x 3.5 x 10

=220 cm^

Total surface area = 220+2 x (22/7) x 3.5^

=220 + 77

=297 cm^