Question

The number of sides of a polygon is 7. How many diagonal does it have?​

Answer 1

Answer:

heptagon

A five-sided shape is called a pentagon. A six-sided shape is a hexagon, a seven-sided shape a heptagon, while an octagon has eight sides… The names of polygons are derived from the prefixes of ancient Greek numbers

Answer 2

By using the formula for the number of diagonals of a polygon with n sides, you can determine how many sides a polygon has if you know the number of diagonals it has. For example, if a polygon has 54 diagonals, find how many sides it has. Then, solve for n using algebra. First multiply both sides by 2.