Question

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

Answer 1

The required cardboard to make the 1 pen stand = C.S.A + bottom side
= 2 pie r h
= 2 * 22/7 * 35 /10 * 105/10 + 22 /7 *35 /10 *35 /10
= 231 + 38.5
=269.5

Now, the area for 25 stands = 269.5 * 25 = 6737. 5cm2

Therefore the cardboard required to make the pen stand = 6737.5cm²

The volume = pie r ² h
= 22 /7 * 35 /10 *35 /10 *105/10
=404.25 cm³

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Answer 2

Step-by-step explanation:

the above ans is absolutely Right ✅