How many vertices in pentagon?

Answer 1

'Penta' ; Latin for five(5), hence 5 vertices.

Modern mathemtica and science falls back on a lot of Latin and Classical Greek names.

Hence

Bi/Di - 2

Tri = 3

Quad/Tetra = 4

Penta = 5

Hexa = 6

Hepta = 7

Octa = 8

Nona = 9

Deca = 10

Centa = 100

Mille = 1000

Even if you only learn the most base of Latin and Classical Greek , you would understandfrom much of the scientific nomenclature(naming system).

Answer 2

there are 5 vertices in pentagon