Listen NCERT Audio Books to boost your productivity and retention power by 2X.
The areas of two concentric circles are 1386 cm2 and 962.5 cm2. The width of the ring is
Let the radius of circle 1 & 2 be R1 and R2 respectively
Area of circle 1 = 1386 cm2
= 1386 cm2
22/7 × = 1386 cm2
1386 × 7/22 cm2 = 441 cm2
R1 = 21 cm
Area of circle 2 = 962.5 cm2
π = 962.5 cm2
22/7 × = 962.5 cm2
962.5 × 7/22 cm2 = 306.25 cm2
R2 = 17.5 cm
Width of the ring = R1 – R2 = 21 -17.5 = 3.5 cm