Geometry

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Across
  1. 6. when two angles add up to equal 90 degrees
  2. 7. bottom face of a 3D shape
  3. 9. when lines interest and form a 90 degree angle
  4. 11. a triangle in which only two sides are the same
  5. 13. closed shape with no curved lines
  6. 14. a triangle in which every side is equal
  7. 15. where two sides meet
  8. 16. Angle an angle of 90 degrees
  9. 18. two figures are the same shape but different sizes
  10. 20. line segment where two faces meet
Down
  1. 1. when two angles add up to equal 180 degrees
  2. 2. two figures are the same size and shape
  3. 3. 2D shape with 4 sides, 4 vertices, and 4 angles
  4. 4. flat surface of a 3D shape
  5. 5. an angle of more than 90 degrees
  6. 8. line segments of a polygon
  7. 10. when two angles don't overlap and share a vertex and side
  8. 12. a triangle in which all sides are different
  9. 17. Triangle a triangle with a 90 degree angle
  10. 19. an angle of less than 90 degrees