Question:
The figure is made up of identical triangles.
Study the above pattern carefully.
(a) How many triangles are there in the 10th layer?
(b) How many shaded triangles are there in the 100th layer?
(c) In which layer will you find 109 triangles?
Solution:
![P6 / River Valley / 2019 / SA2 / Paper 2 – Q11 [3 marks]](https://i0.wp.com/sgprimaths.com/wp-content/uploads/2020/07/P6_River_Valley_2019_Prelims_Paper2_Q11-Qns.jpg?resize=400%2C260&ssl=1)