F.4 Maths Question App

Applications of Trigonometry in 2- dimensional Problems

1. The figure shows a sector OAB where ∠AOB = 50° and P is the mid-point of OB. If the radius of sector is 18 cm, find the area of the shaded region.

2. The rhombus PQRS where PS = PQ = 5cm and RS = RQ = 7 cm ∠PSQ is an equilateral triangle and ∠RSQ is a isosceles triangle . SQ is a centerline

Find the area of the quadrilateral PQRS.