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CBSE Class 9 Answered

cylinder
Asked by fathima12 | 30 Dec, 2009, 12:32: AM
answered-by-expert Expert Answer

Dear Fatima,

Curved Surface area of a cylinder=2r h.

Total Surface area of a culiner =2r ( h+r)= 462 cm2.

It is given that   TSA / CSA=  2r(h+r)  /  2rh  = (h+r) / h =1+(r/h) = 3

 r/h=2 h=r/2

Substitute h=r/2 in TSA equation

2r( r/2  + r)= 3r2  = 462

From the above equation  r= (462    / 3)=7 cm  ;

h= r/2= 3.5 cm

Cylinder Volume V= r2 h =539 cm3  .

 

Regards
Team
TopperLearning

Answered by | 30 Dec, 2009, 10:38: AM

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