the areas of two concentric circles are 1386 cm square and 1886.5 cm sqaure respectively. Find the width of the ring.
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Answer:
Let the radius of the circles be r
1
and r
1
Area of the outer circle
πr
1
2
=1386
=>r
1
2
=
22
1386×7
=>r
1
=21cm
Area of inner circle-
=>πr
2
2
=962.5
=>
7
22
×r
2
2
=962.5
=>r
2
2
=
22
962.5×7
=>r
2
=17.5cm
Width of the ring=r
1
−r
2
=21−17.5=3.5
Step-by-step explanation:
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