Question

154. The curved surface area of a right circular cylinder of height 100 cm is given 4400
x cm”, then the radius of the cylinder is​

Answer 1

Answer:

Circumference of its base =110cm

2πr=110

2 × 22/7 × r =110

44/7 × r = 110

r = 17.5cm

Curved Surface Area = 4400cm²

2πrh = 4400

2 × 22/7 × h × 17.5 = 4400

44/7 × 17.5 × h = 440

h = 4400/40 ×2.5

h = 40cm

Volume = πr²h

= 22/7 × 17.5 × 17.5 × 40

= 38500cm²

Answer 2

1. curved surface area of cylinder = 2 pie r h
2. 4400 = 2 × 22/7 × r × 100
3. 4400/100 ×2 = 22/7 ×r
4. 22 = 22/7 ×r
5. 22×7/22 = r
6. 7 = r

• Ans....Radius of cylinder is 7 cm .