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 / Singapore Chinese Girls / 2019 / SA2 / Paper 2 – Q16 [5 marks]](https://i0.wp.com/sgprimaths.com/wp-content/uploads/2020/07/P6_SCGS_2019_Prelims_Paper2_Q16-Qns.jpg?resize=400%2C260&ssl=1)
![P6 / Maris Stella / 2019 / SA1 / Paper 2 – Q17 [5 marks]](https://i0.wp.com/sgprimaths.com/wp-content/uploads/2020/04/P6_MarisStella_2019_SA1_Paper2_Q17-Qns.jpg?resize=400%2C189&ssl=1)