A hexagon IS a shape but it's a shape with 6 sides and all the interior angles add up to be 360 degrees.
360 degrees :D
The three angles inside the triangle add up to 180 degrees.
Interior: 900 degrees Exterior: 360 degrees
720 degrees on the interior. 360 on the outside.
The three internal angles in a triangle will always add up to 180 degrees.
The 4 interior angles of any quadrilateral add up to 360 degrees
add up all the sides
The interior angles of a regular or irregular pentagon always add up to 540 degrees. So for a regular pentagon, one angle is 108 degrees. 720°
2 equal base angles and a vertex which altogether add up to 180 degrees.
Altogether they add up to 1980 degrees.
Like all other 3-D shapes it adds up to 360 degrees and most people should know this as an object that's angles do not add up to 360 degrees will not be classed as a 3-D shape.