If the radii of two concentric circles are 10 cm and 7 cm, then what is the width of the circular ring formed?

10 cm

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7 cm

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3 cm

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5 cm

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Solution

The correct option is C 3 cm
The area betweent two concentric circles is called a circular ring.
We have two concentric circles here of radii 7 cm and 10 cm.
Width of the circular ring = OB - OA = 10 cm - 7 cm = 3 cm

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