Question

If base radius of cone is 21 cm and slant height is 35 cm, the  total surface area of cone will be :

(A) 3096 cm²

(B) 3696 cm²

(C) 5696 cm²

(D)None of these

Answer 1

Answer is (D) None of these

Given,

Base radius of cone (r) = 21 cm

Slant Height of cone (l) = 35 cm

Total surface area = πr(l + r)

= \(\frac { 22 }{ 7 }\) × 21 × (35 + 21)

= 22 × 3 × 56

= 3696 cm²