geometry

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Across
  1. 2. (of a triangle) having two sides of equal length
  2. 3. a four-sided figure.
  3. 7. a plane figure with eight straight sides and eight angles
  4. 9. having all its sides of the same length
  5. 12. a plane figure with nine straight sides and nine angles.
  6. 14. a plane figure with three straight sides and three angles
  7. 15. an angle of 90
  8. 16. a plane figure with six straight sides and angles.
Down
  1. 1. a plane figure with four straight sides and four right angles
  2. 4. angles measure less than 90 degrees
  3. 5. a parallelogram with opposite equal acute angles, opposite equal obtuse angles, and four equal sides.
  4. 6. a plane figure with twelve sides.
  5. 8. a four-sided plane rectilinear figure with opposite sides parallel.
  6. 10. a plane figure with four equal straight sides and four right angles.
  7. 11. a plane figure with five straight sides and five angles
  8. 13. angles measure more than 90 degrees