tell the answer of his picture
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Step-by-step explanation:
Let the radius of the inner circle be
then the radius of the outer circle will be
Then the circumference of the inner circle will be
and the circumference of the outer circle will be
We know that the ratio of their circumference is
⇒
Cancelling out the :
⇒
Cross-multiplying:
⇒
⇒
⇒
∴The diameter of the inner circle is
Area of the path = Area of the outer circle - Area of the inner circle
=
=
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