2019 4marks Catholic High P6 Paper2 SA1

P6 / Catholic High / 2019 / SA1 / Paper 2 – Q17 [4 marks]

Question:

Lines of the same length and dots of the same size are used to form figures that follow a pattern. The first four figures are shown below.

The table below shows the number of lines and dots used for each figure.

(a) Complete the table for figure 5.
(b) Seventy-two lines are used for one of the figures. What is its figure number?

Solution:

2 thoughts on “P6 / Catholic High / 2019 / SA1 / Paper 2 – Q17 [4 marks]

    1. Hi! Apologies if the solution is not that clear.
      Let me try to explain it further here.

      The pattern is observed as such.

      For every increase of 2 Figure Number (e.g. from Figure 1 to Figure 3), the Number of Lines increase by 12 (7 + 5).

      The initial number of lines = 12.
      The final number of lines = 72.

      Therefore, we need to find out, how many increase of Figure number would allow the initial number of 12 to increase to 72.

      The increase (which is the difference) = 72 – 12 = 60.

      Increase of 12 lines -> Increase of 2 Figure Number
      Increase of 60 lines -> Increase of 2 x 5 = 10 Figure Number

      Initial Figure number = 1
      Final Figure number = 1 + 10 = 11.

      Hope this clarifies!

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