540 degrees.
http://wiki.answers.com/Q/What_do_the_angles_insid...

The interior angles add up to 180 degrees. ChaCha on!
http://www.chacha.com/question/whatdotheinterio...

1. Draw a 1inch horizontal line. This will be the bottom base of the shape. 2. Draw a 1inch vertical line straight up from the left endpoint of the base line. These two lines form
http://www.ehow.com/how_8521469_drawpentagonone...

A pentagon is made up of 5 triangles, so total is 5 x 180deg = 900. Then take away the 360 in the centre and the internal edge ones must be 540deg.
http://answers.yahoo.com/question/index?qid=201005...
