9. The areas of two concentric circles are 962.5 cm² and 1386 cm² respectively. The width of the ring is _____.
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Step-by-step explanation:
Area of Inner circle = 962.5 cm²
962.5 cm² = 22/7 * r * r
r = 17.5 cm
Area of outer circle = 1386 cm²
1386 cm² = 22/7 * R * R
R = 21 cm
Width of ring = 21 cm ‐ 17.5 cm
= 3.5 cm
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