Question

The area of two concentric ring is 726cm²,find the area of the larger circle if the perimeter of the smaller circle is 44cm ​

Answer 1

Step-by-step explanation:

Correct option is

A

43.98 sq. cm

Let the radii of the outer and inner circles be r

2

and r

1

respectively; we have

Area=πr

2

2

−πr

1

2

=π(r

2

2

−r

1

2

)

=π(r

2

−r

1

)(r

2

+r

1

)

=π(5.7−4.3)(5.7+4.3)=π×1.4×10 sq. cm

=3.1416×14sq.cm.=43.98 sq. cm