Geometry

1. - Eight equal sides and eight equal angles. The sum of the interior angles is 1080 degrees.
5. - It is symmetrical. It has only a curved surface, no flat surface, no edges and no vertices.
7. Polygon - The sum of its exterior angles is 360 degrees. It also has straight sides.
9. - The sum of its exterior angles is 360 degrees. Its two angles opposite to the equal sides are congruent to each other.
11. - It has two diagonal sides equal in length. Every angle is 90 degrees.
14. - Its bases are parallel to each other. Its four sides are unequal length.
15. - A triangle has three sides, three angles, and three vertices.

2. - It has no edges or vertices. It has two circular bases that are parallel and congruent.
3. It has four sides and four vertices. All the sides are equal in length.
4. - Its opposite sides of a parallelogram are equal in length, and the opposite angles are equal in measure. The sum of all interior angles are 360 degrees.
6. - It has four sides, four vertices and two diagonals. The sum is 360 degrees.
8. - All three sides are equal in length. They bisect into equal halves.
10. - The two sides are both congruent to each other. Its sum of all internal angles of a triangle is always equal to 180°
11. - All sides are equal in length. Opposite sides are all parallel.
12. - It has six vertices and six angles. It is made up of six equilateral triangles.
13. - It has two congruent bases. It also has two opposite ends that are parallel to each other.