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.
- 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?
- 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?
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]](https://www.geogebra.org/resource/K4aWym2W/FyKUjAUtk3ThmqMV/material-K4aWym2W.png)
Here is another version of ring pattern design:
https://ggbm.at/gnGQMXS7