Question

40×22 cm rectangle is rolled to form a hollow cylinder of height 40 cm find radius of cylinder

Answer 1

Answer:

r=7

Step-by-step explanation:

area of rectangle=C.S.A of cylinder

44 X 22=C.S.A of cylinder

968=C.S.A of cylinder

we know that C.S.A of cylinder is = 2πrh

so,

2πrh=968

r=968 × 7 ÷22×2×22

r=7