Cross word puzzle

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Across
  1. 1. area of all the congruent triangles(5)
  2. 5. rational number neither positive nor negative(4)
  3. 8. distance around a circular region of a circle(13)
  4. 9. quadrilateral which its all sides are equal(6)
  5. 10. lines of symmetry to equilateral trianglr(5)
Down
  1. 2. having the same algebraic factors(9)
  2. 3. polygons having equal sides and angles(7)
  3. 4. fixed value(8)
  4. 6. an expression with only one term(8)
  5. 7. number of edges to the cube(6)