Question

a rectangular sheet of paper 40 cm X 22 cm is rolled to form a hollow cylinder of self 40 cm what is the radius of the cylinder plzz guys tell

Answer 1

Answer: Radius =  3.5 cm

Step-by-step explanation:

Height = 40 cm

Sheet is rolled 22 cm then the circumference of the base circles.

Circumference = 22

2 × 22 ÷ 7 ×  r = 22

2 × 22 ÷ 7 × r = 22 

r = 22 × 1 ÷ 2 × 7 ÷ 22

r = 7 ÷ 2

r = 3.5

Radius =  3.5 cm.