the areas of two concentric circles are 1386cm² and 1886.5cm² respectively . find the width of the ring
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2
Answer:
width of the ring is R - r
So
πR2= 1886.5 cm2
R = 24.5 cm
πr2 = 1386 cm2
r = 21 cm
Hence, R - r = 3.5 cm
Step-by-step explanation:
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Answered by
1
Answer:
Given: The areas of two concentric circles are 1386 sq.cm and 1886.5 sq.cm.
respectively.
Width of the ring = Iarger radius - smaller radius (of the concentric circle)
w = R - r
Area of larger circle e = Pi * R ^ 2 1886.5 5 = 22/7 * (R ^ 2) 85.75x7 =R^ 2
1886.5 x 7/ 2 = R ^ 2
0.25 = R ^ 2
R= √600.25
R = 24.5 cm
Area of smaller circle = Pi r^ 2
1386 = 22/7 * (r ^ 2)
1386 *7/22=r^ 2
63 * 7 = r ^ 2
r ^ 2 = 441
r = √(441)
r = 21 cm
Width of the ring(formed by concentric
circles)=R-r
= 24.5-21
=3cm
Width of the ring = 3 cm
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