Q. 114.3( 274 Votes )

The students of a

Answer :


Radius (r) of the circular end of cylindrical pen holder = 3 cm

Height (h) of pen holder = 10.5 cm

for pen holder the curved Surface Area and Area of Base will be needed

Surface area of 1 pen holder = CSA of pen holder + Area of base of pen holder

= 2πrh + πr2

= [2 x  x 3 x 10.5 +  x (3)2] cm2


= (132 x 1.5 + ) cm2


= (198 + ) cm2



= cm2


Area of cardboard sheet used by 1 competitor = cm2


Area of cardboard sheet used by 35 competitors


=  x 35
= 1584 × 5


= 7920 cm2

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