Which of the following is not the plural form of the word 'Vertex' -

◉ Vertex - is not the plural form of the word 'Vertex'.

◉ Vertex (noun)
English Meaning: the top of the head/a principal or highest point.
Bangla Meaning: শীর্ষ; শীর্ষবিন্দু; চূড়া।
- Vertex এর Plural form - Vertexes এবং Vertices.

Example Sentence:
1. The mountaineers finally reached the vertex of the mountain, where they could admire the breathtaking panoramic view.
2. In geometry class, we learned how to calculate the coordinates of a vertex in a triangle.

Source:
1. merriam-webster.
2. Accessible Dictionary by Bangla Academy.