DAI BIN's answer to help's Secondary 2 Maths Singapore question.
Your (c) is not right
All answers are correct except part c
(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
(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