Question

A rectangular sheet of paper 40 cm ⨯ 22 cm, is rolled to form a hollow cylinder of height 40 cm. The radius of the cylinder (in cm) is
(a)3.5
(b)7
(c)$\frac{80}{7}$
(d)5

Answer 1

Answer:

The radius of the Cylinder is 3.5 cm.

Among the given options option (a) 3.5 cm is the correct answer.

Step-by-step explanation:

When rectangular sheet is rolled to form a hollow cylinder then Length becomes height and breadth becomes the circumference of the base of  cylinder .

Given :  

Height of Cylinder , h  = 40 cm

Circumference of circle = 22 cm

2πr = 22 cm

2 × 22/7 × r = 22 cm

44/ 7 × r = 22  

r = 22 × 7/44

r = 7/2

r = 3.5 cm

Radius of the Cylinder = 3.5 cm

Hence, the radius of the Cylinder is 3.5 cm.

HOPE THIS ANSWER WILL HELP YOU….

 

Answer 2

HOLA MATE

ANSWER:-

2πr=22

r=(22×7)/(2×22)

=7/2

=3.5cm