Question

a conical hole is drilled in a circular cylinder of height 15cm and radius 8cm, which has same height and same base radius. find the T.S.A after drilling of cone

Answer 1

Height of the cylinder = height of the cone = 15 cm

radius = 8 cm

slant height : l² = r² + h²
                     l  =  √8²+ 15²
                     l =    √64 + 25
                    l   = √ 289
                    l = 17 cm

total surface area of the cone = πr(l+r)
                                                = 22/7 × 8 × ( 17 + 8)
                                                = 4400/7
                                                 =628.57 cm²

Answer 2

Step-by-step explanation:

hope this helps you all