using formula,(l=arc)
[tex]l = \frac{theta \: \: 2\pi \: r \: }{360} [/tex]
[tex]24 = (36 \times 2 \times 22 \times r) \div 360 \times 7[/tex]
[tex]24 = \frac{1589r}{2520} [/tex]
[tex]r = \frac{2520 \times 24}{1589} [/tex]
r=38.06cm
r=OA=38.06cm....
HOPE IT HELPS YOU '_'
