Question

Find the area of the region between two concentric circle with radii 9cm and 6cm respectively use 3.14?

Answer 1

Answer:

Let the radius of required circle is r cm.

So, πr

2

=πr

1

2

​

+πr

2

2

​

r

2

=r

1

2

​

+r

2

2

​

r

2

=(8)

2

+(6)

2

r

2

=100

r=10cm