In $\odot( O , r) \overline{ OA }$ and $ \overline{ OB }$ are two radii perpendicular to each other. If the, perimeter of the minor sector formed by those radii is $20\,cm ,$ then $r=\ldots \ldots \ldots . . . cm$
In $\odot( O , r) \overline{ OA }$ and $ \overline{ OB }$ are two radii perpendicular to each other. If the, perimeter of the minor sector formed by those radii is $20\,cm ,$ then $r=\ldots \ldots \ldots . . . cm$
- A
$7$
- B
$3.5$
- C
$2.8$
- D
$5.6$
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