Question:
In the figure below, ABCD is a square of side 20 cm. O is the centre of the square. ABD is a quadrant. AOB and AOD are identical semicircles.
(a) Find the perimeter of the shaded part.
(b) Find the area of the shaded part.
(Take π = 3.14)
Solution:
![P6 / CHIJ / 2018 / SA2 / Paper 2 – Q09 [3 marks]](https://i0.wp.com/sgprimaths.com/wp-content/uploads/2019/08/P6_CHIJ_2018_Prelims_Paper2_Q09.jpg?resize=400%2C260&ssl=1)
![P6 / ACS / 2019 / CA1 – Q13 [2 marks]](https://i0.wp.com/sgprimaths.com/wp-content/uploads/2021/01/P6_ACS_2019_CA1_Q13-Qns.jpg?resize=400%2C260&ssl=1)