9 (a) In triangle ABC, AB = 4 m, BC = 6 m and ABCˆ = 67°. (i) Show that the area of triangle ABC is 11.05 m2 correct to 2 decimal places. (ii) In triangle PQR, PQ = 5 m and QR = 7 m. Area of triangle PQR = Area of triangle ABC. Find the acute angle PQR. (iii) In the parallelogram WXYZ, WX = 8 m and WZ = 2 m. Area of parallelogram WXYZ = Area of triangle ABC. Find the obtuse angle ZWX. (b) AB, AC and CD are three rods. They can be fixed together in different positions. (i) AC = 9 cm and M is a fixed point on AB such that AM = 12 cm. When CAMˆ = 30°, calculate CM. (ii) In another position, the end D of the rod CD is fixed at the point M. CD = 12.5 cm. Calculate the increase in CAMˆ .