Simplify the following text for a Grade 8 native English-speaking person.
Original: The internal angle at each vertex of a regular octagon is 135 Â and the sum of all the internal angles is 1080 Â ( as for any octagon ) .
Simplified: A regular octagon has all eight sides the same length and each side is 135 Â and all the angles added together equals 1080 Â .