6 An arc PQ of a circle centre O and radius r, subtends an angle 0 radians at O 0 The length of the arc PQ is L. Find: a L when r 9 and 0 = 3T br when L = 14.99 and 0-2.98 radians c 0 when L = 49 and r=7. 7 The sector of a circle of radius 15 cmm subtends an angle of 0 radians. Given that the perimeter of the sector is 50cm, find the value of 0. 8 The diagram shows the sector OAB of a circle centre O in which angle AOB is 2.3 radians. Given that the perimeter of the sector is 30 cm, find the length of OA. B 9 Find the perimeter of the segment cut off by a chord of length 14 cm from a circle radius 25 cm.

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