solve - b part with formula
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radius of outer circle = 14/2cm = 7 cm
radius of inner circle=10/2cm = 5cm
width of the circular track = difference of the two radius
=(7-5) cm
=2 cm
radius of outer circle = 14/2cm = 7 cm
radius of inner circle=10/2cm = 5cm
width of the circular track = difference of the two radius
=(7-5) cm
=2 cm
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