Question

If the area of the ring is 147pi centimetres square and the radius of the bigger circle is 2 times the radius of the smaller circle, find the radii of both the circles.

Answer 1

ANS]

⭕R is the radius of big circle, r is the smaller circle

➡Area of ring = 147cm

⚫Area of circle =πr^2

⚫ 147 = πr ^ 2

[147x7]/22=r^2

➡R=6.78

⚫From the condition R= 2r

⚫6.78/2= 3.39=r

➡r=3.39

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Answer 2

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Step-by-step explanation:

R is the radius of big circle, r is the smaller circle

Area of ring = 147cm

Area of circle =πr^2

147 = πr ^ 2

[147x7]/22=r^2

R=6.78

From the condition R= 2r

6.78/2= 3.39=r

r=3.39