Triangles and Edges
Logic
Level
2
How many edges are required to draw Figure 2019 if we continue in the same fashion as the picture?
4039
2019
2020
4037
2018
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1 solution
Note that F n = 2 n + 1 = e , ⟹ F 2 0 1 9 = 2 × 2 0 1 9 + 1 = 4 0 3 9 , where F refers to the Figure and e refers to edges required. Thus, 4039 edges required for figure 2019.