Question

The radii of two concentric circles are 7 CM and 10.5 CM. Find the radii of the region of two enclosed areas​

Answer 1

Answer:

Step-by-step explanation:

We know that area of a circle is πr  

2

, where r be a radius of the circle.

Let us assume R=20 cm & r=15 cm

∴ Required area =π(R  

2

−r  

2

)=π(20  

2

−15  

2

)=175πcm  

2

.

Answer 2

this is the answer of your question