In a circle, the area of a sector formed by two radii perpendicular to each other is $38.5 \,cm ^{2}$. Find the radius of the circle. (in $cm$)
In a circle, the area of a sector formed by two radii perpendicular to each other is $38.5 \,cm ^{2}$. Find the radius of the circle. (in $cm$)
- A
$23$
- B
$19$
- C
$13$
- D
$7$
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