The Mathematical crossword puzzle

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Across
  1. 5. A three-dimensional shape with one Polygonal base and lateral faces that are all triangles that meet at a vertex opposite the base.
  2. 6. A corner of a polygon.
  3. 7. A two-dimensional pattern that can be folded into a three-dimensional figure.
  4. 8. An angle that measures 90 degree.
  5. 9. An ordered pair of numbers used to locate a point on a coordinate grid.
  6. 11. The area required to cover a three-dimensional shape.
  7. 12. A polygon that has all of its sides equal and all of its angles equal.
  8. 13. A shape formed by three or more line segments,called sides.
  9. 15. The measure of the distance around a two-dimensional figure.
Down
  1. 1. A triangle with no sides equal.
  2. 2. A triangle with two sides the same length.
  3. 3. The amount of space occupied by or the capacity of a three-dimensional shape.
  4. 4. Lines that meet at right angles.
  5. 10. The measure of the amount of surface enclosed by the boundary of a figure.
  6. 14. A three-dimensional shape with a top and bottom (base) that are congruent polygons and lateral faces that are parallelograms.