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c.s.a ofcone is pirl. it is given c.s.a is 8118/7 and its base is 1782/7. first we have to find area of the circle which is base of cone area of cone is pir^2 so 22/7 x r^2 = 1782/7 r^2 = 1782/7 x 7/22 r^2 = 1782/22 = 81 r= root 81 r=9 now we have got radius so now we have to calculate volume volume of cone is 1/3pir^2h here we dont know h to find h we have to simplify c.s.a which it was given c.s.a pirl=8118/7 22/7 x 9 x l = 8118/7 l = 8118/7 x 7/22 x 1/9 l= 902/22= 41 hence we find l value now we have to find volume 1/3pir^2h to calculate h we know that slant height formula l^2 = h^2 + r^2 41^2 = h^2 + 9^2 1681= h^2+81 1681-81=h^2 1600=h^2 root 1600=h 40=h volume 1/3pir^2h 1/3 x 22/7 x 9 x 9 x 40 = 3394.28 volume of cone is 3394.28