
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 __
 13.48
 14.08
 13.08
 13
Correct Option : C
90% of area of sheet = Cross sectional area of cone
⇒ 0.9 × π × 30 × 30 = π × r_{1} × 30
⇒ 27 cm = r_{1}
∴ height of the cone =√30²  27² = 13.08 cm
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