if the circumference of 2 concentric circles forming a ring are 88cm and 66cm find width of ring
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circumfrence=2×22/7×r
88 = 2×22/7×r
88×7/22×2=r
r=14 (radius of big circle)
cicumfrence=2×22/7×r
66=2×22/7×r
66×7/22×2=r
21/2=r (radius of small circle)
width of ring=radius of big circle - radius of small circle
=14 - 21/2
=28 - 21/2
=7/2(3.5)
width of ring is 3.5
88 = 2×22/7×r
88×7/22×2=r
r=14 (radius of big circle)
cicumfrence=2×22/7×r
66=2×22/7×r
66×7/22×2=r
21/2=r (radius of small circle)
width of ring=radius of big circle - radius of small circle
=14 - 21/2
=28 - 21/2
=7/2(3.5)
width of ring is 3.5
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