Question:
Mrs Tan pinned a piece of cloth onto the class notice board using some pins. The figure below shows part of the notice board. Pins are placed at an equal distance on the perimeter of the notice board. The distance between every 2 pins is 10 cm. Pins are placed at the 4 corners of the notice board. How many pins are used?
Solution:
![P6 / Nan Hua / 2020 / SA2 Prelims / Paper 1 – Q03 [1 mark]](https://i0.wp.com/sgprimaths.com/wp-content/uploads/2022/02/P6_SA2_2020_Nan_Hua_Paper1_Q03-Qns.jpg?resize=400%2C260&ssl=1)
![P6 / ACS / 2019 / SA2 / Paper 2 – Q04 [2 marks]](https://i0.wp.com/sgprimaths.com/wp-content/uploads/2020/05/P6_ACS_2019_Prelims_Paper2_Q04-Qns.jpg?resize=400%2C260&ssl=1)