Question

A rectangular sheet of metal 88cm long 20 cm board is rolled along its length to form a cylinder. find the curved surface area of the cylinder.​

Answer 1

h=20cm

2πr=88cm

2×

7

22

×r=88cm⇒r=14cm

URl=πr

2

h=

7

22

×14×14×20

=22×2×280

=22×560

=12320cm

Answer 2

Length of the sheet = Circumference of the base .

$= 44 = 2\pi r$

$= r = 44 \times \frac{1}{2} \times \frac{7}{22} = 7$

Radius = 7 cm

Breadth of the metal sheet = height of the cylinder

h = 20 cm

Curved surface Area = 2πrh

$= 2 \times \frac{22}{7} \times 7 \times 20 = 880 \: sq. \: cm$

Curved Surface Area is 880 sq.cm

Hope it helped u__"__"__!!

Please Mark as brainlist__"__"__!!