Question

write the formal to find the number of diagonals of polygon. find the number diagonals of the following polygons: 1 Pentagon​

Answer 1

Answer:

5

Step-by-step explanation:

The formula to find the number of diagonals in a polygon= nC2 - n

Pentagon has 5 sides. Thus n=5

The number of diagonals in a pentagon= 5C2 - 5= [(5!)/{(3!) x (2!)}]-5

When simplified, we get the number of diagonals in a pentagon as 5.