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### See 1 Answer

Your (c) is not right

(a) 12 cm

(b) 9 (pi) cm

(c) 0.75 (pi) radians (135⁰)

(d) 54 (pi) cm²

Note that an obtuse angle is between 90⁰ and 180⁰, which is for minor arc OAB. 180⁰ = pi radians