From a circular sheet of paper of radius 30 cm, a sector of 10% area is removed. If remaining part is used to make a conical surface, then the ratio of the radius and height of the cone is....

• area of circle=curved s.a. of cone; .9*pi*r2=pi*r1*l ; so r1*l=810 now becuse cone is made by circle of radius 30 cm slant height=30cm so r=27 cm from that h=13.02(approx) so (r/h)=2.0647
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• answer is 2.15
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• area of circle=pi*r*r= 900*pi,
  area removed=10% of 900*pi= 90*pi,
  remaining area=900*pi-90*pi= 810*pi,
  pi*r*l=810*pi,
  r=27
  h=under root (l^2-r^2)
  h=3 under root 19
  ratio= 27:3 root 19=9 root 19
• 5 years agoHelpfull: Yes(0) No(0)