This is the fun math crossword by Judah T.

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Across
  1. 1. A corner of a polygon
  2. 4. Lines that go opposite each other and never touch
  3. 5. A triangle with no equal sides
  4. 8. The measurement of the amount of surface enclosed by the boundary of a figure
  5. 9. The amount of space inside a 3D shape
  6. 10. A shape formed by three or more lines
  7. 12. The measurement of the distance around a 2D shape
  8. 13. A pair of numbers used to pinpoint a location on a grid
Down
  1. 2. An angle that measures 90 degrees
  2. 3. A triangle with two sides the same length
  3. 4. A 3D shape with one polygonal base and lateral faces that are all triangles that meet at a vertex opposite the base
  4. 5. The area required to cover a 3D shape
  5. 6. A polygon that has all of its sides equal and all of its angles equal
  6. 7. A 2D shape that can be folded into a 3D shape
  7. 11. A 3D shape with a top and bottom that are congruent polygons and lateral faces that are parallelograms