As shown in the diagram, the radil of two concentric circles are $21\, cm$ and $28 \,cm .$ If $m \angle AOB =40,$ find the area of the shaded region. (in $cm^2$)
As shown in the diagram, the radil of two concentric circles are $21\, cm$ and $28 \,cm .$ If $m \angle AOB =40,$ find the area of the shaded region. (in $cm^2$)
- A
$125.65$
- B
$175.36$
- C
$119.78$
- D
$114.46$
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