Investigation 5.1 - Polygon Sum Conjecture
Triangle (3) - Quadrilateral (4)
The interior angles of a triangle sum up to 180 degrees.
The interior angles of a quadrilateral sum up to 360 degrees.
Pentagon (5) - Hexagon (6)
The interior angles of a pentagon sum up to 540 degrees.
The interior angles of a hexagon sum up to 720 degrees.
Heptagon (7) - Octagon (8)
The interior angles of a heptagon sum up to 899.99 or 900 degrees.
The interior angles of an octagon sum up to 1080 degrees.
STEP 5- Pentago (5)
In the pentagon the diagonal create 3 triangles, all equal to 180. As to show will give you the total measurements of all the interior angles summed up in a pentagon.