# A PEN STAND IS CYLINDRICAL IN SHAPE WITH BASE RADIUS 3.5 CM AND HEIGHT 10.5 CM .HOW MUCH CARDBOARD WILL BE REQUIRED TO MAKE 25 SUCH PEN STANDS/ ALSO FIND VOLUME OF 1 PEN STAND

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by raveenaraj

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by raveenaraj

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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

BASE (b)=3.5cm

HEIGHT(h)=10.5cm

here we need to find TSA of that cylinder and *25

so TSA=2πr(r+h)

by this we do

⇒2 × 22/7 × 3.5 (3.5+10.5)

⇒ 308m² is the amount of cradboard needed for 1 stand

then for 25 stands⇒its 25*308 ⇒ 7700m²

volume = πr²h

⇒22/7 * (3.5)² * 10.5≈ 403.883

if there are any mistakes in answer pls inform me i ll check