The areas of two concentric circles are 962.5 cm^2 and 1386 cm^2 respectively. The width of the ring is ....
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Two circles are concentric
Area of bigger circle = πr²
1386 = 22/7 × r²
r² = 1386×7/22
r² = 9702/22
r² = 441
r = √441
r = 21cm
Area of smaller circle = πr²
962.5 = 22/7 × r²
r² = 962.5 × 7/22
r² = 6737.5 /22
r = √306.25
r = 17.5 cm
Width of ring = 21-17.5
= 3.5cm
Area of bigger circle = πr²
1386 = 22/7 × r²
r² = 1386×7/22
r² = 9702/22
r² = 441
r = √441
r = 21cm
Area of smaller circle = πr²
962.5 = 22/7 × r²
r² = 962.5 × 7/22
r² = 6737.5 /22
r = √306.25
r = 17.5 cm
Width of ring = 21-17.5
= 3.5cm
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