Question:
OPQRS is a part of a circle of diameter 40 cm. OPQR and OQRS are semi-circles. The area of the shaded part OQR is 420 cm² and the perimeter of the shaded part OQR is 78 cm
(a) Find the area of the figure OPQRS.
(b) Find the perimeter of the figure OPQRS.
Take π = 3.14.
Solution:
![P6 / CHIJ / 2018 / SA2 / Paper 2 – Q14 [4 marks]](https://i0.wp.com/sgprimaths.com/wp-content/uploads/2019/08/P6_CHIJ_2018_Prelims_Paper2_Q14.jpg?resize=400%2C260&ssl=1)
![P6 / ACS / 2018 / SA1 / Paper 2 – Q11 [4 marks]](https://i0.wp.com/sgprimaths.com/wp-content/uploads/2021/05/P6_SA1_2018_ACS_Paper2_Q11-Qns.jpg?resize=400%2C260&ssl=1)