Question

curved surface area of a con is 308 cm2 and its slant height is 14 cm. find 
(i) radius of the bases and
(ii) total surface of the con

Answer 1

c.s.a=308cm^2
l=14cm
pie*r*l=308
22/7*r*14=308
r=52/11
tsa=pie*r(r+l)
=22/7*52/11(52/11+14)
=275.28cm^2

Answer 2

CSA of a cone=πrl
308cm2  l=14 cm

308 = 22 ×r×14
            7
308=308 × r
          7
308=44×r
r=7
TSA of cone =πr(r+l)
22×7(7+14)
  7
22×7×21
7
22×147
  7
294
    7
42cm2