we know that area of a sector=(∅/2)*r²--------> when ∅<span> is in radians </span> area of sector inner circle=(∅/2)*r²
area of sector outer circle=(∅/2)*R²-(∅/2)*r²
<span>The ratio of the area of the sector removed from the outer circle to the area of the sector removed from the inner circle is </span>[(∅/2)*R²-(∅/2)*r²]/[(∅/2)*r²]-----> [R²-r²]/[r²]