Q. 74.4( 29 Votes )
Find the total su
Answer :
We have,
Slant height of cone(l ) = 21 m
Radius of cone ( r )= 12 m
Total surface area = πr2+ πrl= πr(r+l)
= 
×12(12+21) m2
=
×12×33 cm2=1244.57 m2
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