There is a track made up of two concentric circles . Milkha singh is running form a point on outer circle to another point on outer circle in a straight line with a distance of 24 m but he touches inner cicle once. Find the area of tracksheet ?
I don't remember the option. but (144 Pie square meter) was a option that i selected

• 24 cm is a chord & perendicular drawn from centre bisects it
  R^2 = r^2 + 12^2
  
  reqd area = pi * ( R^2 - r^2 ) = pi *(r^2 + 144 - r^2) = 144*pi m^2
  
  
• 9 years agoHelpfull: Yes(27) No(0)
• your answer is correct.
• 9 years agoHelpfull: Yes(3) No(0)
• draw a st. line from a point on outer circle touching inner circle & passing through other end of outer circle. it will be a tangent of length (24 cm) to smaller circle.
  draw a perpendicular to this tangent, it will divide tangent in two equal parts.
  
  if 'r' be radius of inner circle & 'R' of outer circle then
  R^2=(12^2+r^2)
  
  amount of synthetic material required = pi(R^2-r^2)=Pi*[(12^2+r^2)-r^2] = 144 pi
• 8 years agoHelpfull: Yes(2) No(0)
• your answer is correct
• 9 years agoHelpfull: Yes(0) No(0)
• 144 pie ans
• 7 years agoHelpfull: Yes(0) No(0)