Numerical Ability Mcq Question

  1. m a circular sheet of paper of radius 30 cm, a sector of 10% area is removed. If the remaining part is used to make a conical surface, then the ratio of the radius and height of the cone is __
  1. 13.48
  2. 14.08
  3. 13.08
  4. 13
Correct Option : C

90% of area of sheet = Cross sectional area of cone
⇒ 0.9 × π × 30 × 30 = π × r1 × 30
⇒ 27 cm = r1
∴ height of the cone =√30² - 27² = 13.08 cm

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