Two triangles are similar if their sides are proportional. We need to make the correspondance depending on the size, both bigger sides, etc.
![\begin{gathered} (27)/(8)=3.375 \\ (20)/(5)=4 \\ (8)/(4)=2 \end{gathered}](https://img.qammunity.org/2023/formulas/mathematics/college/9czjt3mk1jz9h7op8ygdhtia91tciep8l4.png)
Since these three quotients are not equal, then the two triangles are not similar.
Note that both triangles share one side.