Question

The radio of two concentric circles are 28 cm and 18 cm,
respectively, to the perimeter and the area of the circles are
numerically equal. Then find the radius of the circle.​

Answer 1

Answer:

that was the answer

Step-by-step explanation:

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Answer 2

Answer:

Let the radius of required circle =r cm

Radius of 1st circle r

1

=9 cm

Radius of 2nd circle r

2

=19 cm

As per the question

Circumference of the required circle = Sum of circumference of two circles

Circumference of small circle =2πr

1

=2π×9

=18π

Circumference of small circle =2πr

2

=2π×19

=38π

Now,

Circumference of the required circle = Sum of circumference of two circles

2πr=18π+38π

2πr=58π

r=

2π

56π

r=28 cm

Hence, radius of new circle is 28 cm.

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