# 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

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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