Krishna
0

Step 1: Note down the given values

               Curved surface area =   \pi r l = 4070 cm^2

                                Diameter   D = 70 cm

                                Radius       R = \frac{D}{2} = \frac{70}{2} = 35 cm

                                Slant height l = ?


Step 2: Find out the slant height of a cone

             Curved surface area \pi r l = 4070


                                               \frac{22}{7} * 35 * l = 4070          \because \pi = \frac{22}{7} = 3.14


                                               22 * 7 * l = 4070


                                               l = \frac{4070}{22*7}


                                               l = 37 cm


                           Hence, slant height of cone l = 37 cm