math geometry

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Across
  1. 3. ,a flat surface
  2. 4. ,change of one measurement unit to another
  3. 6. ,of equal measure
  4. 8. ,categorize a sorted group
  5. 9. ,square units a figure covers
Down
  1. 1. ,the vertex
  2. 2. ,distance around the other edge of a figure
  3. 5. ,where the sides of two faces meet
  4. 7. , angle greater than 90 degrees
  5. 10. ,angle less then 90 degrees