Q:
# How Many Diagonals Does a Pentagon Have?

**A pentagon has five diagonals on the inside of the shape.** The diagonals of any polygon can be calculated using the formula n*(n-3)/2, where "n" is the number of sides. In the case of a pentagon, which "n" will be 5, the formula as expected is equal to 5.

The number of possible diagonal lines in a polygon is proportional to the number of sides on the shape. The higher the number of sides, the more diagonals the shape will have. When diagonals are drawn in from only one vertex, the diagonal divides a polygon into triangles, which makes it easy to calculate using interior angles using trigonometry. It's important to note that diagonals are not possible in a triangle.

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Q:
## What Is a 3-D Pentagon Called?

A: Usually when a person refers to a "three-dimensional pentagon," he is referring to a regular dodecahedron. A dodecahedron is a solid made of 12 flat faces,... Full Answer >Filed Under: -
Q:
## How Many Triangles Are in an Octagon?

A: In an octagon, there are six triangles formed when diagonals are drawn from each vertex. An octagon is a figure that consists of eight straight sides, and ... Full Answer >Filed Under: -
Q:
## How Many Diagonals Does a Heptagon Have?

A: A heptagon has 14 diagonals. In geometry, a diagonal refers to a side joining nonadjacent vertices in a closed plane figure known as a polygon. The formula... Full Answer >Filed Under: -
Q:
## How Many Diagonals Does an Octagon Have?

A: An octagon has 20 diagonals. A shape's diagonals are determined by counting its number of sides, subtracting three and multiplying that number by the origi... Full Answer >Filed Under: