Question

39. A pen stand is cylindrical in shape with the base radius 3.5 cm and height 10.5 cm. How
much card board will be required to make 25 such pen stands? Also, find volume of 1 pen stand.​

Answer 1

Answer:

Radius of cylinder=3.5cm

height of cylinder=10.5 cm

Total surface area of cylinder=2πr(r+h)

2x22/7x3.5(3.5+10.5)⇒22x14=308cm²

for 1 cylinderstand cardbord sheet require=308cm²

for 25....=308x25=7700cm²

volume of cylinder = πr²h= 22/7x3.5x3.5x10.5=404.25cm³

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Answer 2

Radius of cylinder = 3.5cm

Height of cylinder = 10.5cm

Total surface area of cylinder = 2πr(radius+height)

= 2×22/7×3.5+10.5cm

= 308cm²

For 1 cylinder stand cardboard sheet require=308²cm

For 25 cylinder stand cardboard sheet require=308×25

= 7700cm²

Volume of

cylinder = πr²h22/7×3.5×3.5×10.5 = 404.25cm²

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