Question

a rectangular sheet of paper 40 cm into 22 cm is rolled to form a hollow cylinder of height 40 cm find the radius of the cylinder

Answer 1

height =40
circumference 2 × 22/7 r
22=2×22/7r
r = 7/2

Answer 2

Answer:

Step-by-step explanation:

Area of rectangle = CSA of cylinder

40×22 = 2×22/7×r×40

880 = 44/7×r×40

880/40 = 44/7×r

22 × 7/44 = r

7/2 = r

Therefore , r = 3.5 cm

Hope it help you..☺

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