Question

The curved surface area of a hollow cylinder is 4375cm it is cut along its height and formed a rectangular sheet of width 35cm . Find the perimeter of the rectangular sheet

Answer 1

Find r and R then find the length coz u hv th breadth

Answer 2

Ignore the image

Answer is here:

We have to find perimeter of rectangle.
so we required length and width.

width = 35cm. ( given )
length = circumference of circle.

L = 2πr

C.S.A of cylinder = 2πrh
4375 = 2πr × 35
2πr = 4375/35
2πr = 125 cm

so, L = 125cm

perimeter of rectangle= 2(L+B)
= 2(125 + 35)
= 2(160)
= 320 cm

.....HOPE IT HELPS YOU.....

sorry for wrong answer in the pic.^_^