Math crossword

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Across
  1. 5. A type of triangle with no congruent sides.
  2. 6. A two-dimensional representation of a solid
  3. 9. A shape with 2 sets of parallel sides that are different legnths
Down
  1. 1. A type of triangle with at least 2 congruent sides
  2. 2. A non convex polygon
  3. 3. Distance across the circle through the center
  4. 4. A type of triangle with 3 congruent sides
  5. 5. The height of any of the sides of the triangles themselves, instead of the height of the pyramid
  6. 7. How much room there is inside a 3D shape
  7. 8. How big the bottom of the 3D shape is