Cross patterns
This task is about rules for growing number patterns.
A cross shape was drawn in different sizes. The first two are shown. The cross with a side length of 1 has an area of 5 cm^{2} and the cross with a side length of 2 has an area of 20 cm^{2}.
Here is a table for the area of crosses which have different side lengths.
Side length of the cross (in cm) |
1 |
2 |
3 |
4 |
5 |
10 |
Area of the cross (in cm^{2}) |
5 |
20 |
45 |
80 |
125 |
500 |