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question 4

可隨意移動紅點改變a、b、c的數值。留意藍色圖案的改變。 You may drag the red dots to change the values of a, b and c. Note how the blue pattern below may change.
  1. 根據相同規律,當a=b=c=20,圖中應該總共有多少個藍色小圓。Based on the same rule, when a=b=c=20, how many small blue circles should be there?
  2. 要得到以下圖案,a,b,c的數值應該是什麼?In order to have the pattern in the given picture, what should be the values of a, b and c?
Image
答案 answer: 1. 8000 2. a=11, b=7, c=6
[size=100]sample answers from 63 G6 students in a maths contest
([url=https://www.evernote.com/l/AAP498xPuppGJaFQh7s-ObuWo7BGBopcucI]download original image[/url])[/size]
sample answers from 63 G6 students in a maths contest (download original image)
Here is another version of ring pattern design: https://ggbm.at/gnGQMXS7