Question

If the area of a ring is 147 cm 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

Answer:

r=3.39 & R=6.78

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