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The diagram above shows a sequence of patterns of an arrangement of dots.
1st row indicates the number of dots in the first row and the total indicates the number of dots in each pattern.
(a) By considering the dots that make up each figure in the pattern, calculate the number of dots in Figure 20.
(b) By considering the dots that make up each figure in the pattern, calculate the number of dots in Figure 90.
(c) If the first row of a figure is made up of 21 dots, calculate the number of dots that make up the figure.
Notes to students:
- If the question above has parts, (e.g. (a) and (b)), given that the answer for part (a) is 10 and the answer for part (b) is 12, give your answer as:10,12