Given a table of polygons
For the first row,
Given that the 1 exterior angle of the polygon is given, to find the number of sides, n, the formula is

The number of sides, n, of the polygon is three, thus it is a triangle.
A regular triangle has

For the second row
Given that sum of the interior angles of the polygon is 720°, to find the number of sides of the polygon,
Using the formula to find the sum of the interior angles of a polygon which is

Since the number of sides is 6, thus, it is a hexagon.
For a regular hexagon, is tas

The table is shown below