Find the area of ring between two concentric circles whose circumference are 77cm and 55cm.
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Answer:
Step-by-step explanation:
∵2Πr=88
r=88×72×22=14cm
2ΠR=132cm
R=132×72×22=21cm
The area between two circles
=Π(21)2−Π(14)2
=Π{212−142}
=Π(21+14)(21−14)
=227×35×7=770cm2
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