# The sum of the Interior Angles of a Pentagon

## Pentagon

How many Sides does a Pentagon have ?

What is the sum of the interior angles?

Use the Toolbar of the pentagon above to determine how many triangles are in one Pentagon.

What is angle measurements of any Triangle ?

## Use the Toolbar to divide the Pentagon into lines of symmetry.

How many symmetrical lines were you able to create in one Pentagon ?

After dividing the Pentagon into lines of symmetry. How many triangles were created?

What is the size of one angle at the center of a regular pentagon (five-sided polygon)?