Magic Math Puzzle

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Across
  1. 2. closed figure in a plane that is made of up of 3 or more line segments (ex: triangle, trapezoid)
  2. 6. b x h ÷ 2 = x
  3. 7. 4 sides, 4 right angles and 2 unequal adjacent sides
  4. 9. b x h
Down
  1. 1. made of up triangles, squares, rectangles, etc.
  2. 3. 90 degrees and above
  3. 4. measurement of a surface
  4. 5. A = 1/2h (b1 + b2)
  5. 8. a quadrilateral with 2 parallel sides and 2 non-parallel sides
  6. 10. 90 degrees