Q. 185.0( 2 Votes )

Two cones w

Answer :

Given: Two cones with same base radius 8 cm and height 15 cm.


Formula Used: CSA of cone = πrl


Explanation:


If two cones with same base and height are joined together along their bases, then the shape so formed looks like as figure shown.



Given, that, radius of cones, r = 8 cm and height of the cone, h = 15 cm


So, the surface area of the shape so formed


= Curved area of first cone + Curved surface area of the second cone


Since both cones are identical,


the surface area of the shape = 2× Surface area of the cone


= 2 πrl








= 854.85 cm2


= 855 cm2 (approx.)


Hence, the surface area of the shape is 855 cm2 (approx.)


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