A core cutter of 130 mm height has inner and outer diameters of 100 mm and 106 mm

Q. A core cutter of 130 mm height has inner and outer diameters of 100 mm and 106 mm, respectively. The area ratio of the core cutter (in %, up to two decimal places) is   

Ans: 12.30-12.40

Sol:

         

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