Answer:
If a shape is a regular octagon with eight sides, then the following must be true:
- The shape has eight equal sides.
- The shape has eight equal angles.
- The sum of the interior angles of the shape is 1080 degrees.
- The shape can be divided into 6 equilateral triangles.
- The shape can be divided into 8 congruent isosceles triangles.
- The shape can be inscribed in a circle.
- The shape has rotational symmetry of order 8.