1mark 2019 CA1 P6 Paper1 River Valley P6 / River Valley / 2019 / CA1 / Paper 1 – Q04 [1 mark] Question: Which two lines in the square grid below are perpendicular to each other? Solution: Similar Posts P6 / Henry Park / 2021 / SA2 / Paper 1 – Q08 [1 mark] P6 / Catholic High / 2021 / SA2 / Paper 1 – Q20 [1 mark]