Geometry

[ruthay321]

How many degrees are there if you add all the angles of a regular pentagon? Is there a web site where you can find out stuff like this for my son's homework? Thanks in advance

[stellaqueen]

http://www.bbc.co.uk/schools/

you should be able to find what you need here, its a great site.

[Jules001]

just in case you still need it - in any regular polygon the interior angles should always add up to 360 degrees.

[Quizmonkey]

Jules - what about an equilateral triangle? Isn't that 180 deg?!

[ringer]

It's the exterior angles which add up to 180 degrees.  Try splitting the pentagon up into triangles by joining one vertex (corner) to each of the other vertices.

[Quizmonkey]

How can the exterior angles of a triangle add up to 180? The interior angles are 60 deg each, aren't they?

[kempie]

For any regular polygon the sum of the internal angles is given by  (no. of sides - 2) x 180�

Triangle = (3-2) x 180� = 180�
Square = (4-2) x 180� = 360�
Pentagon = (5-2) x 180� = 540�
Hexagon = (6-2) x 180� = 720�

etc.

[ringer]

oops - I menat the exterior angles always add up to 360 degrees - sorry!!