letters put together

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Across
  1. 6. a three-dimensional solid object in which the two ends are identical
  2. 8. if all the sides and interior angles of the polygons are equal
  3. 10. the point opposite to and farthest from the base in a figure
  4. 11. measures the space needed to cover the outside of a three-dimensional shape
  5. 12. lines that cross each other at a 90 degree angle
  6. 13. a two-dimensional geometric figure that has a finite number of sides
  7. 14. the amount of space in a certain 3D object
Down
  1. 1. a triangle with (at least) two equal sides.
  2. 2. measures the total length around the outside of a shape
  3. 3. is defined as the total space taken up by a flat (2-D) surface or shape of an object.
  4. 4. a triangle with all three sides of different lengths
  5. 5. a pair of numbers which are used to determine the position of a point or a shape in a 2-dimensional plane.
  6. 7. an angle that is exactly equal to 90 degrees
  7. 9. a 3D shape would look like if it was opened out and laid flat
  8. 12. a 3D polyhedron with the base of a polygon along with three or more triangle-shaped faces that meet at a point above the base