The area of the ring between two concentric circles is 3168 cm². Find the radii of the two circles if (1) their sum is 42 cm and (

1 thought on “The area of the ring between two concentric circles is 3168 cm². Find the radii of the two circles if (1) their sum is 42 cm and (”

1. Step-by-step explanation:

   Let two radius are ‘x’ and ‘y’, so,

   x+y=42 (1)

   and

   x−y=28 (2)

   Now adding (1) and (2), we get

   2x=70

   x=35

   Putting in (1)

   35+y=42

   y=7

   Therefore, radius of two concentric circles are 35 cm and 7 cm.

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